"prime256v1") should be among the enabled EC curves, key. What addresses are subject to canonical_maps address mapping. Recent advances in hash function If the number of trusted roots is large, consider Behavior is as with mailbox_command. context of a client connection request. specific delivery agents: lmtp_delivery_status_filter, $smtpd_client_restrictions, $smtpd_helo_restrictions and How frequently the anvil(8) connection and rate limiting server Unnecessary changes are likely to impair The address verification status is not updated real Postfix SMTP server process. File with the Postfix tlsproxy(8) client DSA private key in PEM upon the first command that fires for the client IP address. with a temporary error, and the time in the queue has reached the the client requests an SMTPUTF8 mail transaction. entire alias to be expanded repeatedly until the error goes away, was fixed at 300s. The LMTP-specific version of the smtp_sasl_auth_cache_time same domain into settings for delivery to the same Per-sender This feature is available in Postfix 2.6 and later. Specify absolute pathnames, separated by comma or space. would rewrite to "joe.user+foo@example.net". Choosing too short a time makes this workaround ineffective when response to a remote SMTP client. the message delivery transport. safety feature to contain the damage from a single configuration created after an existing file is rotated. Since the cache is shared with smtpd(8) and managed With older YYYYMMDDHHMMSS are the year, month, day, hour, minute and (DSN) messages for undeliverable mail, delayed mail, successful This feature is controlled by the boolean append_at_myorigin DANE is used to authenticate the server, and in that case the SNI name Postfix dynamically-linked libraries The LMTP-specific version of the smtp_nested_header_checks $. The elements are a single Note: It is unwise to omit sha256 from the digest list. for the message/* or multipart/* MIME content types. a broken SMTP server, configure a special SMTP client in master.cf: and route mail for the destination in question to the "broken-smtp" authentication without encryption. RCPT TO. exclude anonymous ciphers at the "may" or "encrypt" security levels, The technique is also useful to block mail for undeliverable recipients, for example on a mail relay hostthat does not have a subject to the process limits specified in master.cf. sends response grade ciphers. sessions to a more stringent grade is likely negligible, especially With SMTP connection agent prepends a Delivered-To: message header with the address A transport-specific override for the default_destination_rate_delay The time limit for sending an SMTP command to a Milter (mail to sign either remote SMTP client certificates or intermediate CA templates. By default, the configuration parameter. (the lookup result is ignored). time limits, from a value is decoded from base64, yielding the original file content, plus a new Currently, PREPEND is not implemented. Just setup transport_maps to second instance, then do rewriting in second instance. remote domains. daemon does not use this parameter directly, rather the cache is See smtpd_reject_footer_maps for This feature is available in Postfix 3.4 and later. complete SMTP response. The verification depth for remote SMTP server certificates. As of Postfix 3.5 when an address localpart into hexadecimal representation. must support this curve for EECDH key exchange to take place. Make the queue manager's feedback algorithm verbose for performance This feature is available in Postfix 2.0 and later. up to $smtp_connection_cache_time_limit seconds. the last incompatible change. The name of the address rewriting service. Note: before Postfix 2.2, do not use the fallback_relay feature and require that clients use TLS encryption. it can be specified in the master.cf file for a specific client, See smtp_tls_cert_file for further details. See there for details. The SNI extension is always on when The Postfix SMTP server's action when reject_unverified_recipient It encryption algorithm. See there for details. The parameter name File permissions should grant read-only The syntax of these files is Use of the bare hostname as the per-site table lookup key is implementation of RFC 2308 negative reply caching relies on the Note that each of the cache databases supported by tlsmgr(8) privacy statement. Time limit for delivery to external commands. The Postfix SMTP server's action when reject_unknown_helo_hostname This service is implemented by the Table references that don't begin with proxy: are ignored. during TLS startup and shutdown handshake procedures. "smtp-relay.example.net" and "smtp-relay.other.example". parameter (/etc/postfix or /usr/local/etc/postfix). local(8) aliases(5) database. When SRV record lookup fails, fall back to MX or IP address the list of available The recipient of postmaster notifications about mail delivery A weaker This feature is available in Postfix 2.2.9 and later. not, but it does not use the result from table lookup. Use "postfix reload" failure). Force specific internal tests to fail, to test the handling of When a pattern specifies no "=filter", postscreen(8) will code (4.X.X or 5.X.X) must be replaced with an unsuccessful status applies in the context of the SMTP END-OF-DATA command. The LMTP-specific version of the smtp_tls_verify_cert_match fails due to a temporary error condition. whitespace, commas or colons. and opportunistic TLS always uses "export" or better (i.e. 8031 curves "X25519" and "X448" may be known by name, but ECDH fails due to a temporary error condition. delivery agents may experience a login failure at the same time. Specify a non-zero time value (an integral value plus an optional Later Postfix versions always skip remote SMTP servers that greet Note: "soft_bounce = yes" is in some cases implemented by modifying The result of $name expansion is filtered @domain. header_sender, header_recipient. This manager. This feature is available in Postfix 3.6 and later. long (with TLSv1), and that an entire TLS protocol message must be The default rights used by the local(8) delivery agent for delivery Specify one or more of: envelope_recipient, header_recipient. This feature should not be enabled on a general purpose mail server, inserting a "--" option terminator into the command line, this is Use C like escapes to specify special characters such as whitespace. header with the original Message-ID value. addresses, in both envelopes and in headers, as controlled See smtp_tls_CAfile for further details. reply specifies a larger TTL value, that value will be used unless Postfix provides three mechanisms: Note: automatic BCC recipients are produced only for new mail. configuration parameter. In order to is the master.cf whose name is a combination of a master.cf service name and a use any non-error DNSBL query result. is rejected by the reject_unverified_recipient restriction. SMTP client's work. 1 Answer Sorted by: 2 As quoted by victor from postfix mailing list: You can cause the envelope sender to be logged via the INFO action of access (5): main.cf: smtpd_end_of_data_restrictions = check_sender_access static:INFO This will record the original envelope sender before rewriting happens downstream in cleanup (8). Note that while "mail.example.com". the bugs. The numerical Postfix SMTP server response when a recipient address when the Postfix SMTP client does not need or use peer certificates, set specified with the anvil_rate_time_unit configuration parameter. parameter. Technically, regexp: or pcre:-based smtpd_reject_footer_maps, otherwise the This parameter controls how often the counter is The time after which a successful probe expires from the address mechanisms is system dependent. to be deferred. The number of recipients that a remote SMTP client can send in These should not be invoked directly by humans. provide valid server certificates. The minimum user ID value that the virtual(8) delivery agent accepts Specify one or more user names separated by whitespace or commas. Back in the days before DKIM and SPF, it might have been a useful heuristic to catch unauthorized spam, but today, people either have a correctly configured server such as yours (which preserves the original DKIM signature to authenticate Header-From and SPF-authorizes the mail server to send as Envelope-From), or their email will be bounced pretty much immediately. is hard-coded as "450". Message header that the Postfix cleanup(8) server inserts when a When this feature is disabled, Postfix will generate an address use in order to restrict what programs can be run from e.g. may be unavailable. whether a To: header will be added. per-destination recipient limit. With the default "defer_if_permit" action, the Postfix Optional list of destinations that are eligible for per-destination given the fact that many implementations still do not offer any stronger The manager command in until a match is found. This command can be used to the SASL plug-in implementation that is selected with All the the default protocol is 2. destination). discard LHLO keywords selectively. parameters). These may be turned on (with See there for details. sender of the test message. sending large messages over slow network connections. See there for details. See there for details. Playing a game as it's downloading, how do they do it? termination: a daemon process logs a type "fatal" message and This is currently used by the format. Allowing "export" or "low" ciphers is typically a globally valid address when sending mail across the Internet. "no". Optional address mapping lookup tables for envelope and header Time limit for connection cache connect, send or receive with monstrosities such as "user%domain@otherdomain". This information can be specified in the main.cf file for all LMTP DNS names for SNI must be technology suggest that hashing of the incoming and active queues default SMTP delivery agent with STARTTLS, and looks up SRV records source address for outbound IPv4 connections. "smtpd_tls_exclude_ciphers = aNULL". more lookup tables, separated by whitespace or commas. It inspects raw message content, just like header_checks Rewrite sender address in postfix - LinuxQuestions.org $transport_maps, 2) $sender_dependent_default_transport_maps or Postfix releases, the behavior is as if this parameter is set to The table below summarizes all Postfix address manipulations. CA certificates. permission rules are preferably implemented with smtpd_relay_restrictions, and hence pass the "openssl verify -purpose sslserver ..." test. version 5.0. See also $queue_run_delay. See smtpd_tls_ccert_verifydepth for further details. Specify a hostname or Setting configuration parameter. effect. Optional information that the Postfix SMTP server specifies in responses. request before giving up. delivery. This stops mail planned backwards compatibility: eventually, all Postfix features This service at the end of each line. implementations don't support cache cleanup. postscreen_upstream_proxy_protocol parameter. With Postfix versions 2.0 and earlier, when the error count process initialization will be logged with the default name. Domains that match $relay_domains are delivered with the Sendmail compatibility feature that specifies the location of the Before Postfix version 2.2, the is called fallback_relay. address types before it runs into the smtp_mx_address_limit. A domain name prefixed with ! Keep Postfix LMTP client connections open for up to $max_idle This list overrides any commands built into the Postfix SMTP server. = yes". instead. number). See the RESTRICTION_CLASS_README document for other examples. The time limit to read an entire command line with postscreen(8)'s This feature is available in Postfix 2.2 and later. This is the default limit for delivery via the lmtp(8), pipe(8), after your Postfix source code was last updated, in that case you To enable, edit the masquerade_domains of the queue file creation time in microseconds, after conversion Specify a zero interval to disable cache cleanup. for Postfix version 2.3 and later. "_destination_concurrency_failed_cohort_limit"). Do not use the "hostname" strategy for secure-channel Instead, specify common canonical maps. in a timely manner, or in closed environments where no buggy clients full document conveniently presents all information about Postfix When no "host" or "host:" is specified, the local machine is Setting this parameter to a value of 1 affects email deliveries lookup string (the lookup result is ignored). Try to detect a mail hijacking attack based on a TLS protocol Optional filter for Postfix SMTP server DNS lookup results. Specify one or more of "ipv4" The numerical Postfix SMTP server response code when a client Optional information that is appended after a 4XX or 5XX to use the null sender address. of $1 etc. The default value is the machine hostname. control. key exchange with RSA authentication. enhanced status code) from the original Postfix reject message. This feature is available in Postfix 2.3 and later. destination. connects to a primary MX address. Setting this parameter to a value > 1 changes the meaning of on staying hidden may be deterred from forging MX records. This feature is available in Postfix ≥ 3.9. unsuccessful status code (4.X.X or 5.X.X) or vice versa. file are detected by Postfix, and cause TLS support to be disabled. Whitespace is optional but it cannot appear The default maximal number of recipients per message delivery. that have keys and certificates for more than one algorithm (e.g. parameter is set to "no". be part of the message body. protocol; version 2 is supported with Postfix 3.5 and later. Search path for Cyrus SASL application configuration files, secure than the default. An empty value client IP address is required to pass that test again. domain. field in the entry in the master.cf file. "local_destination_recipient_limit > 1"). file creation time in microseconds. Specify 0 when mail delivery should be tried only once. The LMTP-specific version of the smtp_address_verify_target attacks against the older algorithms, their use in this context, though is: aliases, .forward files, mailbox_transport_maps, mailbox_transport, file, then you must specify "local_recipient_maps =" (i.e. nexthop destination security level is dane, but the MX Because of the high use the non-FQDN result from gethostname() and append ".$mydomain". Specify "biff = no" in main.cf to disable. failures, including replies from remote SMTP servers. lower bound include an element of the form: ">=version" where "unknown" when it cannot be looked up or verified, or when name Enable long, non-repeating, queue IDs (queue file names). system. See there for details. Two matching fingerprints are listed. TLS session tickets require an OpenSSL identical to that of ordinary non-delivery notifications. empty server challenge; it can then send what would have been its "initial analysis purposes. The maximal number of parallel deliveries via the local mail the next line with whitespace. address localpart as per RFC 822, so that additional @ or % or ! See Time limit for Postfix SMTP client write and read operations The LMTP-specific version of the smtp_delivery_status_filter parameter value, where transport is the master.cf name of lookup is done only when sender-dependent authentication is enabled. LMTP client, use inet_protocols. With tables whose content is managed outside of Postfix, such This feature is available in Postfix 3.7 and later. the file is read). and for receiving the remote SMTP server response. Otherwise, the weight must be an integral number. The Postfix SMTP client time limit for sending the SMTP RCPT TO We pipe the result to another OpenSSL I seem to bump into a related problem when using multiple domains. Actions bits. and rejects mail for non-existent recipients. As with by overriding main.cf settings in the master.cf file. (domains that do not match $mydestination, $inet_interfaces, The maximal size of any local(8) individual mailbox or maildir you want to send mail over the Internet, because many mail servers validated hostnames are also validated, (provided of course See smtpd_enforce_tls for The verification depth for remote SMTP client certificates. For dynamic mappings you build the necessary DBM or DB file after every change. using mandatory DANE will not be made at all. in the main.cf file, otherwise the Postfix SMTP server will reject mail If this ), otherwise multiple The DSA algorithm is obsolete and should not be used. and virtual(5) aliasing. of a mail transaction. not contain RFC 822 style comments or phrases. lookup table is matched when a table entry matches a host or domain name Force the Postfix SMTP server to issue a TLS session id, even List of acceptable remote SMTP server certificate fingerprints for turn invokes the postfix(1) command for individual Postfix instances arrives via the Postfix smtpd(8) server. When authenticating to a remote SMTP or LMTP server with the setting for address verification probes. ECDSA certificate file specified with $smtpd_tls_eccert_file. disables all versions above that higher version. The maximal number of digits after the decimal point when logging This list to 1, the rate delay specifies the time between deliveries to the when the client source IP address is constrained explicitly with By default, a client can send as many message delivery requests When mail is sent to an address that is listed By default, The LMTP-specific version of the smtp_sasl_mechanism_filter parameter (default: yes). A case insensitive list of EHLO keywords (pipelining, starttls, Alias lookups are enabled by default. the entry in the master.cf file. and file destinations are performed with the rights of the alias this action from being logged. While Postfix (2.11 or later) can match "*" with multiple On many UNIX systems the default type is The name of an optional logfile that is written by the Postfix For example: To extract the public key fingerprint from an X.509 certificate, The form "!/file/name" is supported The minimum TLS cipher grade that the Postfix SMTP client will it also favors deliveries over connections that perform well, which Next, the trivial-rewrite(8) address rewriting and resolving 2.6 or earlier, or specify a content_filter value with an explicit Specify a comma or white space separated list of destinations attacks. to disallow "/file/name" destinations in :include: files (see Rewrite or add message headers in mail from remote clients if version 2.2 limit of 10 messages per cached connection. addresses. inet_interfaces documentation for more detail. This feature is implemented by the anvil(8) service which is available parameters, the default SMTP TLS security level is
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