Catch more bounces

My SMTP server returns bounces to the sender regardless of what it's given as Return-Path.

Studying CiviCRM code I saw that I could make bounce processing work anyway because in /sites/all/modules/civicrm/CRM/Utils/Mail/EmailProcessor.php the entire email body was scanned to find a 'Return-Path'.

So. why didn't it work?

Because there was no space between 'Return-Path' and the rest.

I changed the regular expression:

// a tighter regex for finding bounce info in soft bounces’ mail bodies
// EMS 2015-10-15 fixing return path regex
//$rpRegex = '/Return-Path: ' . preg_quote($dao->localpart) . '(b)' . $twoDigitString . '([0-9a-f]

{16})@' . preg_quote($dao->domain) . '/';
$rpRegex = '/Return-Path:\s*' . preg_quote($dao->localpart) . '(b)' . $twoDigitString . '([0-9a-f]{16}

)@' . preg_quote($dao->domain) . '/';

Now it works because it finds a match regardless of the space being there or not.