Wikimedia Bugzilla is closed!

Sub part of Bug: https://bugzilla.wikimedia.org/show_bug.cgi?id=69019

Extension Wikipage: https://www.mediawiki.org/wiki/Extension:BounceHandler

Quoting: https://bugzilla.wikimedia.org/show_bug.cgi?id=69019#c0
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The BounceHandler extension generates a unique VERP address on every sent email, and has the bouncehandler API that can handle incoming email bounces once the bounce is HTTP POSTed to it via curl from exim. The extension was built as part of the VERP project to properly handle email bounces. 

Pipe incoming bounces to the bouncehandler API:- 
You need to add the following to your incoming mails to *@wikimedia.com receving PIPE transport: 
command = /usr/bin/curl "action=bouncehandler" --data-urlencode "email@-" http://$IP/api.php

The genrated VERP address is of the form 
$wikiId-base36( $UserID )-base36( $Timestamp )-hash( $algorithm,$key, $prefix )@$email_domain 

where 
$wikiId - The wiki database name, to support multiple wikis
$userID - The user_id from table 'user' - to uniquely identify a recipient.
$Timestamp - The unix timestamp.
$prefix = $wikiId. '-'. base_convert( $uid, 10, 36). '-'. base_convert( $timeNow, 10, 36);

It use the Plancake mail parser external library to extract the headers as an addition to the optional inbuilt regex functions. 

Gerrit: https://github.com/wikimedia/mediawiki-extensions-BounceHandler