Difference between revisions of "Postfix"

Revision as of 17:46, 23 May 2011

About

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

Files

/main.cf
/master.cf: formatted list of transport helper applications

Internal Apps

User Applets

/newaliases

Error Messages

Connect to private/dovecot-auth failed: No such file or directory

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 –

change: receive_override_options = no_address_mappings
to this: receive_override_options =

– 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:

local_recipient_maps =
luser_relay = whereToSend

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".

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

I have these open in tabs, so they are probably relevant to something:

Postfix Address Rewriting
trivial-rewrite (manpage)
Postfix Configuration Parameters (includes /main.cf parameters)
Postfix After-Queue Content Filter
Group-Office Mailserver plugin: helps administer Postfix
Mail server using Postfix and Dovecot on Gentoo Linux

Links

Official

home page

Reference

@@ Line 1: / Line 1: @@
 ==About==
 [[category:software]]
-{{#set:type=server}}
+{{#set:thing type=software}}
-{{#set:type=open source}}
+{{#set:architecture=server}}
-{{#set:type=email}}
+[[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.
-[[Postfix]] is an [[open-source]] [[mail transfer agent]] (MTA) for [[POSIX]] systems. It is fully supported by [[Webmin]] and is part of the [[Dovecot]] stack.
 ===Files===
 * [[/main.cf]]
@@ Line 16: / Line 15: @@
 * [[/qmgr]] ([http://postfix.org/qmgr.8.html reference])
 * [[/smtpd]] ([http://postfix.org/smtpd.8.html reference])
-* [[/transport]] (http://www.postfix.org/transport.5.html reference])
+* [[/transport]] ([http://www.postfix.org/transport.5.html reference])
 * [[/trivial-rewrite]] ([http://postfix.org/trivial-rewrite.8.html reference]))
 ===User Applets===