For the forum it might be useful to find / write a phpbb extension that disallows URL shortening services (and known spam domains) and forces a captha check on users posting ANY link to a non-whitelisted domain... (pastebin, a decent image hosting service, winehq, microsoft, codeweavers, google, LMGTFY for a start...)
Even if it is a relative uneffective captcha, it should at least make spamming more difficult...
Wine the mailing list integration, it makes sense to try and get something to strip email addresses (Not sure if the mailing lists archives hide them?) to prevent robots from finding them... (If the official archives is stored in a database (I know phpbb does for the forum), stripping it should be easy (at least for the SQL wizards...))
Gert