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Optional lookup tables for content inspection of MIME related message headers, as described in the header_checks(5) manual page. smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) $myhostname is replaced by the hostname configured for the host, and $mail_name is replaced by the MTA in use. However you don't have to use the variables: How the Postfix SMTP server announces itself to the proxy filter. By default, the Postfix hostname is used.

How to change the hostname and SMTP banner in Postfix on a

With bulk email deliveries, it can be beneficial to run the fallback relay MTA on the same host, so that it can reuse the sender IP address. This speeds up deliveries that are delayed by IP-based reputation systems (greylist, etc.). Note: elliptic curve names are poorly standardized; different standards groups are assigning different names to the same underlying curves. The curve with the X9.62 name "prime256v1" is also known under the SECG name "secp256r1", but OpenSSL does not recognize the latter name. The location of non-executable files that are shared among multiple Postfix instances, such as postfix-files, dynamicmaps.cf, and the multi-instance template files main.cf.proto and master.cf.proto. This directory should contain only Postfix-related files. Typically, the meta_directory parameter has the same default as the config_directory parameter (/etc/postfix or /usr/local/etc/postfix). What categories of Postfix-generated mail are subject to before-queue content inspection by non_smtpd_milters, header_checks and body_checks. Specify zero or more of the following, separated by whitespace or comma. /etc/postfix/main.cf: smtpd_command_filter = pcre:/etc/postfix/command_filter /etc/postfix/command_filter: # Work around clients that send malformed HELO commands. /^HELO\s*$/ HELO domain.invalid # Work around clients that send empty lines. /^\s*$/ NOOP # Work around clients that send RCPT TO:<'user@domain'>. # WARNING: do not lose the parameters that follow the address. /^(RCPT\s+TO:\s*<)'([^[:space:]]+)'(>.*)/ $1$2$3 # Append XVERP to MAIL FROM commands to request VERP-style delivery. # See VERP_README for more information on how to use Postfix VERP. /^(MAIL FROM:\s*<listname@example\.com>.*)/ $1 XVERP # Bounce-never mail sink. Use notify_classes=bounce,resource,software # to send bounced mail to the postmaster (with message body removed). /^(RCPT\s+TO:\s*<.*>.*)\s+NOTIFY=\S+(.*)/ $1 NOTIFY=NEVER$2 /^(RCPT\s+TO:.*)/ $1 NOTIFY=NEVER This feature is available in Postfix 2.7.

To enable remote SMTP servers to verify the Postfix SMTP client certificate, the issuing CA certificates must be made available to the server. You should include the required certificates in the client certificate file, the client certificate first, then the issuing CA(s) (bottom-up order). Access restrictions for mail relay control that the Postfix SMTP server applies in the context of the RCPT TO command, before smtpd_recipient_restrictions. See SMTPD_ACCESS_README, section "Delayed evaluation of SMTP access restriction lists" for a discussion of evaluation context and time. The minimum amount of time that postscreen(8) will use the result from a successful DNS-based reputation test before a client IP address is required to pass that test again. If the DNS reply specifies a larger TTL value, that value will be used unless it would be larger than postscreen_dnsbl_max_ttl.

Postfix skips curve names that are unknown to OpenSSL, or that are known but not yet implemented. This makes it possible to "anticipate" support for curves that should be used once they become available. In particular, in some OpenSSL versions, the new RFC 8031 curves "X25519" and "X448" may be known by name, but ECDH support for either or both may be missing. These curves may appear in the default value of this parameter, even though they'll only be usable with later versions of OpenSSL. The Postfix SMTP server's action when reject_unknown_helo_hostname fails due to a temporary error condition. Specify "defer" to defer the remote SMTP client request immediately. With the default "defer_if_permit" action, the Postfix SMTP server continues to look for opportunities to reject mail, and defers the client request only if it would otherwise be accepted. To prevent mailer loops between MX hosts and fall-back hosts, Postfix version 2.2 and later will not use the fallback relays for destinations that it is MX host for (assuming DNS lookup is turned on). smtpd_tls_dh1024_param_file = /etc/postfix/dh2048.pem This feature is available with Postfix version 2.2.

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  1. By default (see smtpd_tls_ask_ccert), client certificates are not requested, and smtpd_tls_CApath should remain empty. In contrast to smtpd_tls_CAfile, DNs of Certification Authorities installed in $smtpd_tls_CApath are not included in the client certificate request message. MUAs with multiple client certificates may use the list of preferred Certification Authorities to select the correct client certificate. You may want to put your "preferred" CA or CAs in $smtpd_tls_CAfile, and install the remaining trusted CAs in $smtpd_tls_CApath.
  2. File with the Postfix tlsproxy(8) client RSA private key in PEM format. See smtp_tls_key_file for further details. The preferred way to configure tlsproxy client keys and certificates is via the "tlsproxy_client_chain_files" parameter.
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  4. When used in command_execution_directory, forward_path, or luser_relay, ${recipient_delimiter} is replaced with the actual recipient delimiter that was found in the recipient email address (Postfix 2.11 and later), or it is replaced with the main.cf recipient_delimiter parameter value (Postfix 2.10 and earlier).
  5. The default maximal number of parallel deliveries to the same destination. This is the default limit for delivery via the lmtp(8), pipe(8), smtp(8) and virtual(8) delivery agents. With per-destination recipient limit > 1, a destination is a domain, otherwise it is a recipient.
  6. File with the Postfix SMTP server RSA private key in PEM format. This file may be combined with the Postfix SMTP server RSA certificate file specified with $smtpd_tls_cert_file. With Postfix ≥ 3.4 the preferred way to configure server keys and certificates is via the "smtpd_tls_chain_files" parameter.

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SMTP Banner Check problem / Postfix install / Ubuntu 18

  1. PENALTY time for [address]:port During this time, all attempts by the client to deliver mail will be deferred with a 450 SMTP status.
  2. Test online your smtp server health, this tool is useful to discover possible problems related to your SMTP server, checks if the greeting message is well formed, the acceptance of sys-ops messages and if the server is an open rela
  3. The list of environment parameters that a privileged Postfix process will import from a non-Postfix parent process, or name=value environment overrides. Unprivileged utilities will enforce the name=value overrides, but otherwise will not change their process environment. Examples of relevant parameters:
  4. Pattern matching of domain names is controlled by the presence or absence of "qmqpd_authorized_clients" in the parent_domain_matches_subdomains parameter value.
  5. Note: the (smtp|lmtp)_delivery_status_filter is applied only once per recipient: when delivery is successful, when delivery is rejected with 5XX, or when there are no more alternate MX or A destinations. Use smtp_reply_filter or lmtp_reply_filter to inspect responses for all delivery attempts.
  6. The {v} macro value for Milter (mail filter) applications. See MILTER_README for a list of available macro names and their meanings.

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notify_classes = bounce, delay, policy, protocol, resource, software notify_classes = 2bounce, resource, software nullmx_reject_code (default: 556) The numerical reply code when the Postfix SMTP server rejects a sender or recipient address because its domain has a nullmx DNS record (an MX record with an empty hostname). This is one of the possible replies from the restrictions reject_unknown_sender_domain and reject_unknown_recipient_domain. Reject mail with invalid Content-Transfer-Encoding: information for the message/* or multipart/* MIME content types. This blocks mail from poorly written software. Specify "tls_append_default_CA = no" to prevent Postfix from appending the system-supplied default CAs and trusting third-party certificates.

Postfix will not send the authentication info contained in smtp_sasl_password_maps file because it as no entry for the server gmail-smtp.l.google.com but has one for smtp.gmail.com If you apply smtp_tls_per_site settings then smtp_cname_overrides_servername may become obsolete Enable 'transitional' compatibility between IDNA2003 and IDNA2008, when converting UTF-8 domain names to/from the ASCII form that is used for DNS lookups. Specify "yes" for compatibility with Postfix ≤ 3.1 (not recommended). This affects the conversion of domain names that contain for example the German sz and the Greek zeta. See http://unicode.org/cldr/utility/idna.jsp for more examples.

Postfix Configuration Parameter

SMTP - SMTP Banner Check - MxToolbo

Optional filter to replace the delivery status code or explanatory text of successful or unsuccessful deliveries. This does not allow the replacement of a successful status code (2.X.X) with an unsuccessful status code (4.X.X or 5.X.X) or vice versa. As long as no secure DNS lookup mechanism is available, false hostnames in MX or CNAME responses can change the server hostname that Postfix uses for TLS policy lookup and server certificate verification. Even with a perfect match between the server hostname and the server certificate, there is no guarantee that Postfix is connected to the right server. See TLS_README (Closing a DNS loophole with obsolete per-site TLS policies) for a possible work-around. The address type ("ipv6", "ipv4" or "any") that the Postfix SMTP client will try first, when a destination has IPv6 and IPv4 addresses with equal MX preference. This feature has no effect unless the inet_protocols setting enables both IPv4 and IPv6.

The OpenSSL toolkit provides a set of options that applications can enable to tune the OpenSSL behavior. Some of these work around bugs in other implementations and are on by default. You can use the tls_disable_workarounds parameter to selectively disable some or all of the bug work-arounds, making OpenSSL more strict at the cost of non-interoperability with SSL clients or servers that exhibit the bugs. Setting this parameter to a value of 1 changes the meaning of lmtp_destination_concurrency_limit from concurrency per domain into concurrency per recipient. #!bin/bash # # Postfix (SMTP) # Postfix handles the transmission of email between servers # using the SMTP protocol. It is a Mail Transfer Agent (MTA). # # Postfix listens on port 25 (SMTP) for incoming mail from # other servers on the Internet. It is responsible for very # basic email filtering such as by IP address and greylisting, # it checks that the destination address is valid, rewrite

POSTFIX SMTP banner based on MX hostname (PostFix 2

Optional lookup tables with the Postfix SMTP client TLS usage policy by next-hop destination and by remote SMTP server hostname. When both lookups succeed, the more specific per-site policy (NONE, MUST, etc) overrides the less specific one (MAY), and the more secure per-site policy (MUST, etc) overrides the less secure one (NONE). With Postfix 2.3 and later smtp_tls_per_site is strongly discouraged: use smtp_tls_policy_maps instead. The minimum TLS cipher grade that the Postfix SMTP server will use with opportunistic TLS encryption. Cipher types listed in smtpd_tls_exclude_ciphers are excluded from the base definition of the selected cipher grade. The default value is "medium" for Postfix releases after the middle of 2015, "export" for older releases. Postfix SMTP Email + OpenDKIM Dashboard. Dashboard to visualize data from Postfix and OpenDKIM. Features. Supports Postfix log messages; Supports OpenDKIM log message

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sender_canonical_maps = hash:/etc/postfix/sender_canonical sender_dependent_default_transport_maps (default: empty) A sender-dependent override for the global default_transport parameter setting. The tables are searched by the envelope sender address and @domain. A lookup result of DUNNO terminates the search without overriding the global default_transport parameter setting. This information is overruled with the transport(5) table. The postfix(1) command invokes the manager command with the postfix(1) non-option command arguments on the manager command line, and with all installation configuration parameters exported into the manager command process environment. The manager command in turn invokes the postfix(1) command for individual Postfix instances as "postfix -c config_directory command". Note 1: the dotlock method requires that the recipient UID or GID has write access to the parent directory of the recipient's mailbox file. By default, mail is returned to the sender when a destination is not found, and delivery is deferred when a destination is unreachable. Enable sender-dependent authentication in the Postfix SMTP client; this is available only with SASL authentication, and disables SMTP connection caching to ensure that mail from different senders will use the appropriate credentials.

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The action that postscreen(8) takes when a remote SMTP client's combined DNSBL score is equal to or greater than a threshold (as defined with the postscreen_dnsbl_sites and postscreen_dnsbl_threshold parameters). Specify one of the following: This feature supports the two-character sequence \n as a request for a line break in the footer text. Postfix automatically inserts after each line break the three-digit SMTP reply code (and optional enhanced status code) from the original Postfix reject message.

The LMTP-specific version of the smtp_reply_filter configuration parameter. See there for details. Note: Postfix 2.9.0–2.9.5 computed the public key fingerprint incorrectly. To use public-key fingerprints, upgrade to Postfix 2.9.6 or later. The OpenSSL cipherlist for "high" grade ciphers. This defines the meaning of the "high" setting in smtpd_tls_ciphers, smtpd_tls_mandatory_ciphers, smtp_tls_ciphers, smtp_tls_mandatory_ciphers, lmtp_tls_ciphers, and lmtp_tls_mandatory_ciphers. You are strongly encouraged to not change this setting. When the remote SMTP servername is a DNS CNAME, replace the servername with the result from CNAME expansion for the purpose of logging, SASL password lookup, TLS policy decisions, or TLS certificate verification. The value "no" hardens Postfix smtp_tls_per_site hostname-based policies against false hostname information in DNS CNAME records, and makes SASL password file lookups more predictable. This is the default setting as of Postfix 2.3. To get the behavior before Postfix version 2.2, specify "local_header_rewrite_clients = static:all".

Change the behavior of the smtpd_timeout and smtpd_starttls_timeout time limits, from a time limit per read or write system call, to a time limit to send or receive a complete record (an SMTP command line, SMTP response line, SMTP message content line, or TLS protocol message). This limits the impact from hostile peers that trickle data one byte at a time. disable_vrfy_command = no dns_ncache_ttl_fix_enable (default: no) Enable a workaround for future libc incompatibility. The Postfix implementation of RFC 2308 negative reply caching relies on the promise that res_query() and res_search() invoke res_send(), which returns the server response in an application buffer even if the requested record does not exist. If this promise is broken, specify "yes" to enable a workaround for DNS reputation lookups. The following restrictions are specific to the domain name information received with the ETRN command.

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By default the temporary whitelist is not shared with other postscreen(8) daemons. See Sharing the temporary whitelist below for alternatives. Pattern matching of domain names is controlled by the presence or absence of "permit_mx_backup_networks" in the parent_domain_matches_subdomains parameter value. The LMTP-specific version of the smtp_pix_workaround_threshold_time configuration parameter. See there for details. The default value for the extra per-transport limit imposed on the number of in-memory recipients. This extra recipient space is reserved for the cases when the Postfix queue manager's scheduler preempts one message with another and suddenly needs some extra recipients slots for the chosen message in order to avoid performance degradation. In all cases the result of table lookup must be either "not found" or a list of SASL names separated by comma and/or whitespace.

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Invalid list elements are logged with a warning and disable DANE support. TLSA RRs that specify digests not included in the list are ignored with a warning. Bonjour, lorsque je vais sur mxtoolbox, j'ai ce message pour le test du serveur mail : warning ; Reverse DNS does not match SMTP Banner Qu'est ce que je dois faire pour corriger le problème? Les boites orange.fr et voila.fr ne reçoivent mes.. This parameter is available in Postfix version 2.2 and earlier. With Postfix version 2.3 and later, see lmtp_connection_cache_on_demand, lmtp_connection_cache_destinations, or lmtp_connection_reuse_time_limit. The default per-transport maximum delay between recipients refills. When not all message recipients fit into the memory at once, keep loading more of them at least once every this many seconds. This is used to make sure the recipients are refilled in timely manner even when $default_recipient_refill_limit is too high for too slow deliveries.

What can cause the SMTP banner to be delayed? - Cisc

  1. List of commands that the postscreen(8) server considers in violation of the SMTP protocol. See smtpd_forbidden_commands for syntax, and postscreen_non_smtp_command_action for possible actions.
  2. It's far from feature complete but it will get you started on authenticated SMTP sessions using Postfix. Quick & dirty. Installing Postfix and SASL on CentOS: # yum install postfix # yum install cyrus-sasl cyrus-sasl-plain cyrus-sasl-md5. Let's move on to the configuration now. Below you will find my default template for /etc/postfix/main.cf
  3. Note: transport_recipient_refill_limit parameters will not show up in "postconf" command output before Postfix version 2.9. This limitation applies to many parameters whose name is a combination of a master.cf service name and a built-in suffix (in this case: "_recipient_refill_limit").
  4. Some spambots send their mail through open proxies. A symptom of this is the usage of commands such as CONNECT and other non-SMTP commands. Just like the Postfix SMTP server's smtpd_forbidden_commands feature, postscreen(8) has an equivalent postscreen_forbidden_commands feature to block these clients. postscreen(8)'s deep protocol test for this is disabled by default.
  5. Permanent white/blacklist for remote SMTP client IP addresses. postscreen(8) searches this list immediately after a remote SMTP client connects. Specify a comma- or whitespace-separated list of commands (in upper or lower case) or lookup tables. The search stops upon the first command that fires for the client IP address.
  6. This feature is available in Postfix 2.3 and later. rewrite_service_name (default: rewrite) The name of the address rewriting service. This service rewrites addresses to standard form and resolves them to a (delivery method, next-hop host, recipient) triple.
  7. A file containing CA certificates of root CAs trusted to sign either remote TLS server certificates or intermediate CA certificates. See smtp_tls_CAfile for further details.

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Optional address that receives a "blind carbon copy" of each message that is received by the Postfix mail system. A certificate supplied here must be usable as an SSL server certificate and hence pass the "openssl verify -purpose sslserver ..." test. Enable additional Postfix tlsproxy(8) client logging of TLS activity. See smtp_tls_loglevel for further details. /etc/postfix/master.cf: smtp inet n - n - 1 postscreen Uncomment the new "tlsproxy unix ... tlsproxy" service in master.cf. This service implements STARTTLS support for postscreen(8).

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Enable "pipelining" SMTP protocol tests in the postscreen(8) server. These tests are expensive: a good client must disconnect after it passes the test, before it can talk to a real Postfix SMTP server. So you should probably fix up those DNS entries (and if applicable also adjust your EHLO banner to respond with mail or smtp, dependant on the ip the connection originates from (if it's the same machine behind both) Wietse threw together a crude prototype with pregreet and dnsbl support in June 2009, because he needed something new for a Mailserver conference presentation in July. Ralf Hildebrandt ran this code on several servers to collect real-world statistics. This version used the dnsblog(8) ad-hoc DNS client program.

Modify the SMTP banner on Receive connectors Microsoft Doc

  1. /etc/postfix/master.cf: broken-smtp . . . smtp -o smtp_quote_rfc821_envelope=no and route mail for the destination in question to the "broken-smtp" message delivery with a transport(5) table.
  2. _user (default: no) Allow a sender or recipient address to have `-' as the first character. By default, this is not allowed, to avoid accidents with software that passes email addresses via the command line. Such software would not be able to distinguish a malicious address from a bona fide command-line option. Although this can be prevented by inserting a "--" option ter
  3. Mime input processing is enabled by default, and is needed in order to recognize MIME headers in message content.
  4. Specify a list of network/netmask patterns, separated by commas and/or whitespace. The mask specifies the number of bits in the network part of a host address. You can also specify hostnames or .domain names (the initial dot causes the domain to match any name below it), "/file/name" or "type:table" patterns. A "/file/name" pattern is replaced by its contents; a "type:table" lookup table is matched when a table entry matches a lookup string (the lookup result is ignored). Continue long lines by starting the next line with whitespace. Specify "!pattern" to exclude an address or network block from the list. The form "!/file/name" is supported only in Postfix version 2.4 and later.
  5. Note: the command is subject to $name expansion, before it is passed to the default command interpreter. Specify "$$" to produce a single "$" character.

How To Install and Configure Postfix as a Send-Only SMTP

The per-destination amount of delivery concurrency negative feedback, after a delivery completes with a connection or handshake failure. Feedback values are in the range 0..1 inclusive. With negative feedback, concurrency is decremented at the beginning of a sequence of length 1/feedback. This is unlike positive feedback, where concurrency is incremented at the end of a sequence of length 1/feedback. Use transport_transport_rate_delay to specify a transport-specific override, where the initial transport is the master.cf name of the message delivery transport. The local(8) delivery agent will silently ignore requests to use the proxymap(8) server within alias_maps. Instead it will open the table directly. Before Postfix version 2.2, the local(8) delivery agent will terminate with a fatal error.

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There are actually mail servers which will outright drop your messages if the reverse lookup does not match up. If I remember this right then it was one of the options auto-enabled when you switch on the so-called spam-protection features from MS-Exchange. So fixing this is not bad practice. With tables whose content is managed outside of Postfix, such as LDAP, MySQL, PostgreSQL, socketmap and tcp, the value must be a concatenation of the desired PEM keys and certificate chains, that is then further encoded to yield a single-line base64 string. Creation of such tables and secure storage (the value includes private key material) are outside the responsibility of Postfix. smtp_sasl_auth_cache_name = proxy:btree:/var/lib/postfix/sasl_auth_cache This feature is available in Postfix 2.5 and later. If you also want to verify client certificates issued by these CAs, you can add the CA certificates to the smtpd_tls_CAfile, in which case it is not necessary to have them in the smtpd_tls_cert_file, smtpd_tls_dcert_file (obsolete) or smtpd_tls_eccert_file.

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The time limit for sending an SMTP command to a Milter (mail filter) application, and for receiving the response. smtpd_client_message_rate_limit = 1000 smtpd_client_new_tls_session_rate_limit (default: 0) The maximal number of new (i.e., uncached) TLS sessions that a remote SMTP client is allowed to negotiate with this service per time unit. The time unit is specified with the anvil_rate_time_unit configuration parameter.

propagate_unmatched_extensions = canonical, virtual, alias, forward, include propagate_unmatched_extensions = canonical, virtual proxy_interfaces (default: empty) The network interface addresses that this mail system receives mail on by way of a proxy or network address translation unit. HANGUP after time from [address]:port in test name Translation: the SMTP client at [address]:port disconnected unexpectedly, time seconds after the start of the test named test name.

With "postscreen_pipelining_enable = yes", postscreen(8) detects zombies that send multiple commands, instead of sending one command and waiting for the server to reply. File with DH parameters that the Postfix tlsproxy(8) server should use with export-grade EDH ciphers. See smtpd_tls_dh512_param_file for further details. The default SMTP server cipher grade is "medium" with Postfix releases after the middle of 2015, and as a result export-grade cipher suites are by default not used. smtpd_sender_restrictions = reject_unknown_sender_domain smtpd_sender_restrictions = reject_unknown_sender_domain, check_sender_access hash:/etc/postfix/access smtpd_service_name (default: smtpd) The internal service that postscreen(8) hands off allowed connections to. In a future version there may be different classes of SMTP service. The OpenSSL cipherlist for "NULL" grade ciphers that provide authentication without encryption. This defines the meaning of the "null" setting in smtpd_mandatory_tls_ciphers, smtp_tls_mandatory_ciphers and lmtp_tls_mandatory_ciphers. You are strongly encouraged to not change this setting. # Distinguish inbound MTA logging from submission and smtps logging. smtp inet n - n - - smtpd submission inet n - n - - smtpd -o syslog_name=postfix/$service_name smtps inet n - n - - smtpd -o syslog_name=postfix/$service_name # Distinguish outbound MTA logging from inbound relay logging. smtp unix - - n - - smtp relay unix - - n - - smtp -o syslog_name=postfix/$service_name service_throttle_time (default: 60s) How long the Postfix master(8) waits before forking a server that appears to be malfunctioning.

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The time after which a client closes an active internal communication channel. The purpose is to allow Postfix daemon processes to terminate voluntarily after reaching their client limit. This is used, for example, by the Postfix address resolving and rewriting clients. The message digest algorithm used to construct remote SMTP server certificate fingerprints. At the "fingerprint" TLS security level (smtp_tls_security_level = fingerprint), the server certificate is verified by directly matching its certificate fingerprint or its public key fingerprint (Postfix 2.9 and later). The fingerprint is the message digest of the server certificate (or its public key) using the selected algorithm. With a digest algorithm resistant to "second pre-image" attacks, it is not feasible to create a new public key and a matching certificate (or public/private key-pair) that has the same fingerprint. A transport-specific override for the default_recipient_refill_delay parameter value, where transport is the master.cf name of the message delivery transport.

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The LMTP-specific version of the smtp_mx_address_limit configuration parameter. See there for details. I don't personally know why anyone would care, but if this matters to you, either change your server's hostname to match the PTR record, or have your provide change the PTR record to match the hostname. I would add a brief thank you for being open about the domain name involved in this question, which made it much easier to answer. Ask Ubuntu is a question and answer site for Ubuntu users and developers. It only takes a minute to sign up. Smtp relay connector in exchange server email protection spf dkim and dmarc email protection spf dkim and dmarc woltlab suite reverse lookupReverse Dns Does Not Match Smtp Banner G Suite Admin MunityReverse Dns Does Not Match Smtp BannerReverse Dns Does Not Match Smtp Banner Zoho Server On BlakGmail Failed To Send Email Toward My Pany Read More

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The numerical SMTP reply code (XYZ) takes precedence over the enhanced status code (X.Y.Z). When the enhanced status code initial digit differs from the SMTP reply code initial digit, or when no enhanced status code is present, the Postfix SMTP client uses a generic enhanced status code (X.0.0) instead. To enable this feature, specify a non-zero time value (an integral value plus an optional one-letter suffix that specifies the time unit).

Postfix is an efficient and feature-rich mail server that was designed by Wietse Venema at the IBM T.J. Watson Research Center. It was intended to be a replacement for the popular sendmail.While Sendmail was the most popular mail server for many years, Postfix popularity has likely grown beyond that of Sendmail, due to its simple configuration, historically secure implementation, and high. Disable DNS lookups in the Postfix SMTP and LMTP clients. When disabled, hosts are looked up with the getaddrinfo() system library routine which normally also looks in /etc/hosts. As of Postfix 2.11, this parameter is deprecated; use smtp_dns_support_level instead. Important note: these protocol tests are disabled by default. They are more intrusive than the pregreet and DNSBL tests, and they have limitations as discussed next.

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Note: if you use the mailbox_command feature to deliver mail system-wide, you must set up an alias that forwards mail for root to a real user. You should only enable features via the hexadecimal mask when the need to control the feature is critical (to deal with a new vulnerability or a serious interoperability problem). Postfix DOES NOT promise backwards compatible behavior with respect to the mask bits. A feature enabled via the mask in one release may be enabled by other means in a later release, and the mask bit will then be ignored. Therefore, use of the hexadecimal mask is only a temporary measure until a new Postfix or OpenSSL release provides a better solution. The safe setting: append "domain.invalid" to incomplete header addresses from remote SMTP clients, so that those addresses cannot be confused with local addresses.

How much time a Postfix daemon process may take to handle a request before it is terminated by a built-in watchdog timer. The solution uses connection caching in a way that differs from Postfix version 2.2. By limiting the amount of time during which a connection can be used repeatedly (instead of limiting the number of deliveries over that connection), Postfix not only restores fairness in the distribution of simultaneous connections across a set of MX hosts, it also favors deliveries over connections that perform well, which is exactly what we want.

The LMTP-specific version of the smtp_tls_policy_maps configuration parameter. See there for details. SMTP stands for Simple Mail Transfer Protocol (SMTP) and it's used for transmitting electronic mail. It's platform-independent, so long as the server can send ASCII text and can connect to port 25 (the standard SMTP port). Sendmail and Postfix are two of the commonest SMTP implementations and are usually included in most Linux distributions Note: with Postfix version 2.2, message header address rewriting happens only when one of the following conditions is true:

relay_recipient_maps = hash:/etc/postfix/relay_recipients This feature is available in Postfix 2.0 and later. The message digest algorithm to construct remote SMTP client-certificate fingerprints. See smtpd_tls_fingerprint_digest for further details. See canonical(5), local(8), relocated(5) and virtual(5) for the effects of recipient_delimiter on lookups in aliases, canonical, virtual, and relocated maps, and see the propagate_unmatched_extensions parameter for propagating an extension from one email address to another. Note: The dotlock method requires that the recipient UID or GID has write access to the parent directory of the mailbox file. For compatibility reasons this feature is on by default. On systems with lots of interactive users, the biff service can be a performance drain. Specify "biff = no" in main.cf to disable.

postscreen(8) should not be used on SMTP ports that receive mail from end-user clients (MUAs). In a typical deployment, postscreen(8) handles the MX service on TCP port 25, while MUA clients submit mail via the submission service on TCP port 587 which requires client authentication. Alternatively, a site could set up a dedicated, non-postscreen, "port 25" server that provides submission service and client authentication, but no MX service. In order of decreasing precedence, the nexthop destination is taken from $sender_dependent_default_transport_maps, $default_transport, $sender_dependent_relayhost_maps, $relayhost, or from the recipient domain. Enable support for the original recipient address after an address is rewritten to a different address (for example with aliasing or with canonical mapping).

Before Postfix version 2.2, the default list of hashed queues was significantly larger. Claims about improvements in file system technology suggest that hashing of the incoming and active queues is no longer needed. Fewer hashed directories speed up the time needed to restart Postfix. The amount of time that postscreen(8) will cache an expired temporary whitelist entry before it is removed. This prevents clients from being logged as "NEW" just because their cache entry expired an hour ago. It also prevents the cache from filling up with clients that passed some deep protocol test once and never came back. This feature should not be enabled on a general purpose mail server, because it will reject mail after a single violation. The Postfix SMTP client time limit for completing a TCP connection, or zero (use the operating system built-in time limit).

smtpd_client_new_tls_session_rate_limit = 100 smtpd_client_port_logging (default: no) Enable logging of the remote SMTP client port in addition to the hostname and IP address. The logging format is "host[address]:port". How much time a postscreen(8) process may take to respond to a remote SMTP client command or to perform a cache operation before it is terminated by a built-in watchdog timer. This is a safety mechanism that prevents postscreen(8) from becoming non-responsive due to a bug in Postfix itself or in system software. To avoid false alarms and unnecessary cache corruption this limit cannot be set under 10s. The maximum length of a SASL client's response to a server challenge. When the client's "initial response" is longer than the normal limit for SMTP commands, the client must omit its initial response, and wait for an empty server challenge; it can then send what would have been its "initial response" as a response to the empty server challenge. RFC4954 requires the server to accept client responses up to at least 12288 octets of base64-encoded text. The default value is therefore also the minimum value accepted for this parameter. Stack Exchange Network. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.. Visit Stack Exchang Additional list of ciphers or cipher types to exclude from the Postfix SMTP client cipher list at mandatory TLS security levels. This list works in addition to the exclusions listed with smtp_tls_exclude_ciphers (see there for syntax details).

The Postfix tlsproxy(8) server security grade for ephemeral elliptic-curve Diffie-Hellman (EECDH) key exchange. See smtpd_tls_eecdh_grade for further details. With locally submitted mail, append the string "@$myorigin" to mail addresses without domain information. With remotely submitted mail, append the string "@$remote_header_rewrite_domain" instead.

The default amount of delay that is inserted between individual message deliveries to the same destination and over the same message delivery transport. Specify a non-zero value to rate-limit those message deliveries to at most one per $default_destination_rate_delay. The Postfix SMTP client time limit for sending the XFORWARD command, and for receiving the remote SMTP server response. In the standard form, the name will be quoted if it contains specials as defined in RFC 5322, or the "!%" address operators.

WARNING: The purpose of this feature is to limit abuse. It must not be used to regulate legitimate mail traffic. Note: with Postfix 2.2 and earlier the sender will be notified when the BCC address is undeliverable. File with the Postfix SMTP server RSA certificate in PEM format. This file may also contain the Postfix SMTP server private RSA key. With Postfix ≥ 3.4 the preferred way to configure server keys and certificates is via the "smtpd_tls_chain_files" parameter. The message digest algorithm used to construct remote TLS server certificate fingerprints. See smtp_tls_fingerprint_digest for further details.

The Postfix SMTP client considers non-MX "[nexthop]" and "[nexthop]:port" destinations equivalent to statically-validated MX records of the form "nexthop. IN MX 0 nexthop." Therefore, with "dnssec" support turned on, validated hostname-to-address lookups apply to the nexthop domain of any "[nexthop]" or "[nexthop]:port" destination. This is also true for LMTP "inet:host" and "inet:host:port" destinations, as LMTP hostnames are never subject to MX lookups. The time limit for Postfix SMTP server write and read operations during TLS startup and shutdown handshake procedures. The current default value is stress-dependent. Before Postfix version 2.8, it was fixed at 300s. /etc/postfix/main.cf: # Log all "permit" actions. smtpd_log_access_permit_actions = static:all /etc/postfix/main.cf: # Log "permit_dnswl_client" only. smtpd_log_access_permit_actions = permit_dnswl_client This feature is available in Postfix 2.10 and later.

Specify a list of network/netmask patterns, separated by commas and/or whitespace. The mask specifies the number of bits in the network part of a host address. You can also "/file/name" or "type:table" patterns. A "/file/name" pattern is replaced by its contents; a "type:table" lookup table is matched when a table entry matches a lookup string (the lookup result is ignored). Continue long lines by starting the next line with whitespace. Specify "!pattern" to exclude an address or network block from the list. The form "!/file/name" is supported only in Postfix version 2.4 and later. The best practice algorithm is now sha1. Recent advances in hash function cryptanalysis have led to md5 being deprecated in favor of sha1. However, as long as there are no known "second pre-image" attacks against md5, its use in this context can still be considered safe. If you use this feature, run "postmap /etc/postfix/canonical" to build the necessary DBM or DB file after every change. The changes will become visible after a minute or so. Use "postfix reload" to eliminate the delay. The setting "smtp_address_preference = any" is safe. With this, mail will eventually be delivered even if there is an outage that affects IPv6 or IPv4, as long as it does not affect both. File with the Postfix tlsproxy(8) server ECDSA private key in PEM format. This file may be combined with the Postfix tlsproxy(8) server ECDSA certificate file specified with $smtpd_tls_eccert_file. See smtpd_tls_eckey_file for further details. With Postfix ≥ 3.4 the preferred way to configure tlsproxy server keys and certificates is via the "tlsproxy_tls_chain_files" parameter.

A safety net that causes Postfix to run with backwards-compatible default settings after an upgrade to a newer Postfix version. Optional lookup tables with all valid addresses in the domains that match $relay_domains. Specify @domain as a wild-card for domains that have no valid recipient list, and become a source of backscatter mail: Postfix accepts spam for non-existent recipients and then floods innocent people with undeliverable mail. Technically, tables listed with $relay_recipient_maps are used as lists: Postfix needs to know only if a lookup string is found or not, but it does not use the result from table lookup. Feb 28 03:34:18 ubuntu postfix/master[6306]: warning: process /usr/lib/postfix/virtual pid 7169 exit status 1 Feb 28 03:34:18 ubuntu postfix/master[6306]: warning: /usr/lib/postfix/virtual: bad command startup -- throttling postconf -n alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_dot_mydomain = no biff = n $ openssl x509 -noout -fingerprint -digest -in certfile.pem The text to the right of "=" sign is the desired fingerprint. For example:

This feature is available in Postfix 2.5. The default setting is compatible with earlier Postfix versions. The action that postscreen(8) takes when a remote SMTP client sends multiple commands instead of sending one command and waiting for the server to respond. Specify one of the following: Template message body text may contain $name references to Postfix configuration parameters. The result of $name expansion can be previewed with "postconf -b file_name" before the file is placed into the Postfix configuration directory. To enable a remote SMTP client to verify the Postfix SMTP server certificate, the issuing CA certificates must be made available to the client. You should include the required certificates in the server certificate file, the server certificate first, then the issuing CA(s) (bottom-up order). The per-table I/O buffer size for programs that read Berkeley DB hash or btree tables. Specify a byte count.

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