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[[Postfix]] is an [[open source]] [[mail transfer agent]] (MTA) for [[POSIX]] systems. It is fully supported by [[Webmin]]/[[VirtualMin]] and is part of the [[Dovecot]] stack.
[[Postfix]] is an [[open source]] [[mail transfer agent]] (MTA) for [[POSIX]] systems. It is fully supported by [[Webmin]]/[[VirtualMin]] and is part of the [[Dovecot]] stack.
===Pages===
===Pages===
* [[/aliasing]]: managing email redirects/aliases
* [[/fixing]]: diagnosis of installations that aren't working right
* [[/fixing]]: diagnosis of installations that aren't working right
* see also: [[DKIM]], [[DMARC]], [[Sender Policy Framework]] (SPF)
* [[/chroot]]: running Postfix in a [[chroot]]ed environment
===Files===
===Files===
* [[/main.cf]]
* [[/main.cf]]
Line 103: Line 107:
* [[/flow]]: the flow of messages across the various helper programs that make up Postfix
* [[/flow]]: the flow of messages across the various helper programs that make up Postfix
* [[/SSL]]: Postfix and SSL
* [[/SSL]]: Postfix and SSL
==Notes==
==Notes==
After making changes to the Postfix configuration files, you don't actually have to stop and restart Postfix to load the changes; you can just type (as root) "postfix reload".
After making changes to the Postfix configuration files, you don't actually have to stop and restart Postfix to load the changes; you can just type (as root) "postfix reload".
===aliases===
To set up aliases, either edit the file specified by the [[/main.cf/alias_maps|alias_maps]] setting in [[/main.cf|main.cf]] ([[etc/aliases|/etc/aliases]] by default) and then run [[newaliases]] (or "postalias /etc/aliases") to update the database, or else use [[Webmin]] ("Mail Aliases" icon, then click on the "Create a new alias" link).
There is also a <code>/etc/postfix/virtual</code> file for aliases in virtual domains.
'''Notes''':
* Webmin seems to automatically run newaliases when you add or modify an individual alias, but ''not'' when you use it to edit the [[etc/aliases|/etc/aliases]] file directly. Changes made to /etc/aliases will not take effect until the database is updated.
* Stopping and starting the postfix daemon does ''not'' update from the aliases file; you still have to run newaliases.
* see [http://www.postfix.org/aliases.5.html aliases] for more information.
===virtual users===
By default, virtual aliases seem to get looked up only when email comes from the outside; locally generated emails are "returned" as undeliverable with the error message "Diagnostic-Code: x-unix; user unknown"
The following change in main.cf solves that problem &ndash;
* '''change''': {{link/subpage|pfx=/main.cf/|receive_override_options}} = no_address_mappings
* '''to this''': receive_override_options =
&ndash; but creates a new one, in that externally-sourced messages are now delivered ''twice'' (or ''four'' times if addressed directly to a virtual user instead of a virtual alias).
Someone who understands the internal structure of postfix could probably figure out what this means (and how to fix it), but I'm still working on it.
===catch-all===
To set up a catch-all address, edit {{link/subpage|main.cf}} and set the following parameters:
* {{link/subpage|pfx=/main.cf/|local_recipient_maps}} =
* {{link/subpage|pfx=/main.cf/|luser_relay}} = <u>whereToSend</u>
The syntax for <u>whereToSend</u> is explained [http://www.postfix.org/postconf.5.html#luser_relay here].
Examples:
* luser_relay = $user@anotherdomain.org
** forwards all email addressed to "invaliduser@firstdomain.org" to "invaliduser@anotherdomain.org"
* luser_relay = youraddress@anotherdomain.org
** forwards all email addressed to invalid users to "youraddress@anotherdomain.org".
[http://www.cyberciti.biz/faq/howto-setup-postfix-catch-all-email-accounts/ This page] mentions some other parameters but neglects the ones above.


===automatic BCC===
===automatic BCC===

Latest revision as of 16:00, 17 September 2021

<hide> page type::article thing type::software software type::mail transfer agent architecture::server license::open source </hide>

About

Postfix is an open source mail transfer agent (MTA) for POSIX systems. It is fully supported by Webmin/VirtualMin and is part of the Dovecot stack.

Pages

Files

Internal Apps

User Applets

Other Applets

These are installed as part of the postfix package; not sure how they should be classified:

Error Messages

Other Subpages

  • /flow: the flow of messages across the various helper programs that make up Postfix
  • /SSL: Postfix and SSL

Notes

After making changes to the Postfix configuration files, you don't actually have to stop and restart Postfix to load the changes; you can just type (as root) "postfix reload".

automatic BCC

To automatically BCC outgoing mail from any given set of users, set sender_bcc_maps in /main.cf to hash:/etc/postfix/sender_bcc. (In Webmin: BCC Mapping: Sender BCC mapping lookup tables)

Each line in the /sender_bcc file will contain the sender (which can be user@domain, user, or @domain), one or more blanks, then the recipient (which can be one address or multiple addresses separated by commas).

Example -- BCCs all mail sent by vbz.com users to an archive address: 

@vbz.com archive2026@vbz.com

pages to index

Possibly useful pages:

Official

Reference

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