Using Procmail with Plesk: rules via Ingo

In my previous post, I discussed how to get automatic procmail integration working with Plesk, to let you set up procmailrc rules to sort mail into folders. At the end of the post, I mentioned that it would be nice to figure out how to get Plesk’s version of Ingo set up to generate the rules for us automatically. Well, turns out it’s pretty easy! Once you set up procmail (as described in my previous post), and make the changes after the break to your Ingo config, any filters that users define via Plesk’s Horde/Imp/Ingo implementation will become server-side rules automatically. It’s surprisingly easy, and extremely versatile! The one downside is that if you edit the procmailrc files by hand, and then save rules in Ingo, your changes will be overwritten.

First, you need to set a password for the ‘popuser’ user, and remove the user from ‘/etc/ftpusers’. This will allow Ingo to FTP into the system as that user, and update procmailrc entries.

Then, you need to edit the Ingo config. For some reason, Plesk 9’s Ingo package for Debian has config files in two locations:
/etc/psa/webmail/horde/ingo/backends.php
/etc/psa-horde/ingo/backends.php

I’m not sure which one actually gets used, so I created a symlink:

# rm -f /etc/psa-horde/ingo/backends.php
# ln -s /etc/psa/webmail/horde/ingo/backends.php /etc/psa-horde/ingo/backends.php


Then, we need to edit this file. There should be a default entry that looks like:

/* IMAP Example */
$backends['imap'] = array(
'driver' => 'null',
'preferred' => 'localhost',
'hordeauth' => true,
'params' => array(),
'script' => 'imap',
'scriptparams' => array()
);


That’s not going to do anything for us, so nuke it. Then, copy and paste the entry below:


$split = explode('@', Auth::getAuth());
$backends['procmail'] = array(
'driver' => 'vfs',
'preferred' => 'localhost',
'hordeauth' => 'false',
'params' => array(
'vfstype' => 'ftp',
'hostspec' => 'localhost',
'filename' => '/var/qmail/mailnames/'.$split[1].'/'.$split[0].'/.procmailrc',
'port' => 21,
'username' => 'popuser',
'password' => 'password'
),
'script' => 'procmail',
'scriptparams' => array(
'path_style' => 'maildir',
'variables' => array(
'MAILDIR' => '/var/qmail/mailnames/' . $split[1] . '/' . $split[0] . '/Maildir',
'DEFAULT' => '${MAILDIR}/'
)
)
);


Simply change the password entry to the password you set for popuser. Then, log out of webmail and back in, set up a filter, and it should have updated the procmailrc entry for you. It’s magic!

Again, if this is useful or if you have any questions, please leave me a comment!