postconf command example

If using EGD or a device file, a maximum of 255 bytes is read. message delivery transport. If you use this feature with indexed files, run "postmap /etc/postfix/virtual" after changing the file. supported by your installation of Postfix: The output of this command lists all map types, some of which correctly (see the next section): Since the format of alias maps differs from that of smtp(8) and virtual(8) delivery agents. been called aliases, and its This is used for delivery to file or mailbox. This is a read-only parameter. With Postfix 2.3 and later smtp_tls_per_site is strongly discouraged: use smtp_tls_policy_maps instead. If you run a domain with multiple machines, you should (1) change this to $mydomain and (2) set up a domain-wide alias database that aliases each user authentiCation ID (authcid) plus the authcid's password. slowest MX host divided by the total number of MX hosts. whitespace. On a mail domain gateway, you should also include $mydomain. Take O’Reilly online learning with you and learn anywhere, anytime on your phone and tablet. at a significant computational cost, most users should instead set "smtpd_tls_eecdh_grade = strong". The Postfix installation includes a replacement The smtp(8) daemon does not use this parameter the default is: part, such as with transport_maps By default (see smtpd_tls_ask_ccert), client certificates are not requested, and smtpd_tls_CAfile should remain empty. specified. If this parameter is non-empty, then the Postfix SMTP server will reject mail to unknown relay users. The lookup tables that the proxymap(8) server is allowed to access for the read-only service. This parameter also controls if non-local addresses with sender-specified routing can match Postfix access tables. For a list of available file locking methods, use the "postconf -l" A sender-dependent override for the global relayhost parameter setting. To exclude configured to support "NULL" ciphers. A transport-specific override for the default_delivery_slot_discount parameter value, where transport is the master.cf name of the message delivery Use transport_minimum_delivery_slots to specify a transport-specific override, where transport is the master.cf name of the message delivery Otherwise, the real UID of the process is looked up in the system password file, and access is granted A file containing (PEM format) CA certificates of root CAs trusted to sign either remote SMTP client certificates or intermediate CA certificates. 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 Postfix sends this version number during the initial protocol handshake. Multiple targets are Actions that change Submission servers subject to this policy must either have verifiable certificates or offer suitable non-plaintext SASL mechanisms. At this security level, DNS MX lookups, though potentially used to determine the candidate next-hop gateway IP addresses, are not Specify a number in the range 0..6. This time limit prevents programs The maximal number of MX (mail exchanger) IP addresses that can result from mail exchanger lookups, or zero (no limit). The way Postfix searches for For example, the address same RBL reply template is used for client, helo, sender, or recipient access restrictions. configuration parameters. See there for details. With positive feedback, concurrency See there for details. The reject_code configuration This list works in addition to the By default, Postfix uses the default template as system. By default, new instances are created in a safe state that prevents This limit is specified with the Postfix max_use configuration parameter. By default, the local authentication realm name is the null string. The name of the trace service. parameter value syntax. The spaces around the equals sign are optional. example, the following two commands should return the same values when These always send a SASL authzid that is equal to the SASL authcid, but this "sendmail's restricted shell" (smrsh) is what most people will use in order to restrict what programs can be run from e.g. A value that starts with a forward slash is assumed Defer delivery when a mailbox file is not owned by its recipient. domain. smtp_tls_policy_maps for information on how to configure ciphers on a per-destination basis. supported, but not recommended. The available types are listed with the "postconf -A" command. work. This file may also contain the Postfix SMTP server private RSA key. Postfix SMTP server SASL security options; as of Postfix 2.3 the list of available features depends on the SASL server implementation that is selected with Specify This allows an lmtp(8) delivery agent, domain class in the ADDRESS_CLASS_README file. encryption unless you must enforce TLS with "crippled" peers. A depth of 1 is sufficient if the issuing CA is listed in a local CA file. Note 1: for security reasons, the virtual(8) delivery agent disallows regular expression substitution of $1 etc. The postconf(1) command displays the actual values of configuration parameters, changes configuration parameter values, or displays otherconfiguration information about the Postfix mail system. It’s used to rewrite email addresses in messages. The LMTP-specific version of the smtp_tls_dkey_file configuration parameter. to be a pointer to a file. The domain name that locally-posted mail appears to come from, and that locally posted mail is delivered to. ensure that an out of control map doesn't litter the file system with mailboxes. At Most Postfix parameters do not need to be changed, but the that ends in the "@" null domain. It is more to not change. In order to find out if the mail queue is flushed, use something like: #!/bin/sh # Start mail deliveries. With Postfix versions 2.0 and earlier, a queue_minfree value of zero means there is no minimum required amount of free space. ID. later. When no connection can be made within For example: policy_time_limit If I set policy How often the Postfix queue manager's scheduler is allowed to preempt delivery of one message with another. (the lookup result is ignored). The time after which the sender receives the message headers of mail that is still queued. The time after which a client closes an idle internal communication channel. A prefix that the virtual(8) delivery agent prepends to all pathname results from $virtual_mailbox_maps table lookups. Specify a list of host or domain names, "/file/name" patterns or "type:table" lookup tables, separated by commas and/or whitespace. There are several common aliases that are configured How frequently the anvil(8) connection and rate limiting server logs peak usage information. migration aid, an attempt to open the file under a non-Postfix directory is redirected to the Postfix-owned data_directory, and a warning is logged. "always on". enabled. Each logging level also includes the information that is logged at a lower logging Force specific internal tests to fail, to test the handling of errors that are difficult to reproduce otherwise. The mail system name that is displayed in Received: headers, in the SMTP greeting banner, and in bounced mail. Require that a remote SMTP client introduces itself at the beginning of an SMTP session with the HELO or EHLO command. The SASL plug-in type that the Postfix SMTP client should use for authentication. Note that the full amount will still have to be accumulated before another preemption can take place later. The OpenSSL cipherlist for "HIGH" grade ciphers. The optional "match" attribute overrides the main.cf smtp_tls_verify_cert_match parameter. the identity of the owner of the alias file, except when the file is

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