So much spam now comes from accounts with compromised credentials (via SMTP AUTH or webmail), I think both RBLs and greylisting are somewhat outdated techniques, don’t expect them to be as effective as in 1995 or 2005. Use them if you wish to reduce the load on your mail filter, but you aren’t going to achieve acceptable performance without a good content based filter. Plus customers expect virus filtering which is going to require an anti-virus scanner.
From: Paul Stewart Sent: Wednesday, April 01, 2015 5:55 PM To: af@afmug.com Subject: Re: [AFMUG] open source email spam filter Spamassassin combined with RBL’s and greylisting … if you implement greylisting you’ll want to whitelist some systems (like Amazon EWS for example where this list originates from) From: Af [mailto:af-boun...@afmug.com] On Behalf Of Chuck McCown Sent: Wednesday, April 1, 2015 5:04 PM To: af@afmug.com Subject: Re: [AFMUG] open source email spam filter gmail... From: Tim Reichhart Sent: Wednesday, April 01, 2015 2:53 PM To: af@afmug.com Subject: [AFMUG] open source email spam filter Hey Guys Who do you guys use for spam filter like barracuda but in open source for your email server? Tim
