Bugfix in the content matching regular expression: parenthesis were misplaced.
Adjust regular expressions:
... For security reasons we do not accept messages containing images
... Blocked by policy: blacklisted URL in mail
... URL in message blacklisted
... MSN/Hotmail changed their blacklist error message
Bugfix: don't complain about empty callbacks.
Bugfix: make the debug flag work.
Adjust content and recipient rejection regular expressions.
Notice hotmail bounces.
Major bug fixed: parameters weren't passed through. The module didn't work. Now it does.
Search for the string "Spam source" as an indication of a problem.