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Postfix Documentation
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Using VERP with majordomo etc. mailing lists

In order to make VERP useful with majordomo etc. mailing lists, you would configure the list manager to submit mail according to one of the following two forms:

Postfix 2.3 and later:

% sendmail -XV -f owner-listname other-arguments...

% sendmail -XV+= -f owner-listname other-arguments...

Postfix 2.2 and earlier (Postfix 2.3 understands the old syntax for backwards compatibility, but will log a warning that reminds you of the new syntax):

% sendmail -V -f owner-listname other-arguments...

% sendmail -V+= -f owner-listname other-arguments...

The first form uses the default main.cf VERP delimiter characters. The second form allows you to explicitly specify the VERP delimiter characters. The example shows the recommended values.

This text assumes that you have set up an owner-listname alias that routes undeliverable mail to a real person:

/etc/aliases:
    owner-listname: yourname+listname

In order to process bounces we are going to make extensive use of address extension tricks.

You need to tell Postfix that + is the separator between an address and its optional address extension, that address extensions are appended to .forward file names, and that address extensions are to be discarded when doing alias expansions:

/etc/postfix/main.cf:
    
recipient_delimiter = +
    
forward_path = $home/.forward${
recipient_delimiter}${extension},
        $home/.forward
    
propagate_unmatched_extensions = canonical, virtual

(the last two parameter settings are default settings).

You need to set up a file named .forward+listname with the commands that process all the mail that is sent to the owner-listname address:

~/.forward+listname:
    "|/some/where/command ..."

With this set up, undeliverable mail for [email protected] will be returned to the following address:

[email protected]

which is processed by the command in your .forward+listname file. The message should contain, among others, a To: header with the encapsulated recipient sender address:

To: [email protected]

It is left as an exercise for the reader to parse the To: header line and to pull out the user=domain part from the recipient address.

Postfix Documentation
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