Difference between revisions of "Postfix"

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<hide>
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[[page type::article]]
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[[thing type::software]]
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[[software type::mail transfer agent]]
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[[architecture::server]]
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[[license::open source]]
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[[category:software]]
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</hide>
 
==About==
 
==About==
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[[category:software]]
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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.
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{{#set:thing type=software}}
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===Pages===
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{{#set:architecture=server}}
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* [[/fixing]]: diagnosis of installations that aren't working right
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[[Postfix]] is an [[license::open source]] [[function::mail transfer agent]] (MTA) for [[POSIX]] systems. It is fully supported by [[Webmin]] and is part of the [[Dovecot]] stack.
 
 
===Files===
 
===Files===
 
* [[/main.cf]]
 
* [[/main.cf]]
 
* [[/master.cf]]: formatted list of transport helper applications
 
* [[/master.cf]]: formatted list of transport helper applications
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* [[/mail.log]] (typically found in /var/log)
 
===Internal Apps===
 
===Internal Apps===
 
* [[/aliases]] ([http://www.postfix.org/aliases.5.html reference])
 
* [[/aliases]] ([http://www.postfix.org/aliases.5.html reference])
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===Error Messages===
 
===Error Messages===
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* [[503 5.5.1 Error: authentication not enabled]]
 
* [[Connect to private/dovecot-auth failed: No such file or directory]]
 
* [[Connect to private/dovecot-auth failed: No such file or directory]]
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===Other Subpages===
 
===Other Subpages===
 
* [[/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
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* luser_relay = youraddress@anotherdomain.org
 
* luser_relay = youraddress@anotherdomain.org
 
** forwards all email addressed to invalid users to "youraddress@anotherdomain.org".
 
** forwards all email addressed to invalid users to "youraddress@anotherdomain.org".
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[http://www.cyberciti.biz/faq/howto-setup-postfix-catch-all-email-accounts/ This page] mentions some other parameters but neglects the ones above.
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===automatic BCC===
 
===automatic BCC===
 
To automatically [[blind carbon copy|BCC]] outgoing mail ''from'' any given set of users, set [[/main.cf/sender_bcc_maps|sender_bcc_maps]] in [[/main.cf]] to <u>hash:/etc/postfix/sender_bcc</u>. (In [[Webmin]]: BCC Mapping: Sender BCC mapping lookup tables)
 
To automatically [[blind carbon copy|BCC]] outgoing mail ''from'' any given set of users, set [[/main.cf/sender_bcc_maps|sender_bcc_maps]] in [[/main.cf]] to <u>hash:/etc/postfix/sender_bcc</u>. (In [[Webmin]]: BCC Mapping: Sender BCC mapping lookup tables)
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  @vbz.com archive{{CURRENTYEAR}}@vbz.com
 
  @vbz.com archive{{CURRENTYEAR}}@vbz.com
 
===pages to index===
 
===pages to index===
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I have these open in tabs, so they are probably relevant to something:
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Possibly useful pages:
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* [https://www.howtoforge.com/postfix_backup_mx Setting Up Postfix As A Backup MX]
 
* [http://www.postfix.org/ADDRESS_REWRITING_README.html Postfix Address Rewriting]
 
* [http://www.postfix.org/ADDRESS_REWRITING_README.html Postfix Address Rewriting]
 
* [http://www.postfix.org/trivial-rewrite.8.html trivial-rewrite] (manpage)
 
* [http://www.postfix.org/trivial-rewrite.8.html trivial-rewrite] (manpage)

Revision as of 14:11, 29 October 2020

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

  • /fixing: diagnosis of installations that aren't working right

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".

aliases

To set up aliases, either edit the file specified by the alias_maps setting in main.cf (/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).

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 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 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 –

– 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 main.cf and set the following parameters:

The syntax for whereToSend is explained 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".

This page mentions some other parameters but neglects the ones above.

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 archive2024@vbz.com

pages to index

Possibly useful pages:

Links

Official

Reference

Retrieved from "https://htyp.org/mw/index.php?title=Postfix&oldid=26778"