Russell Coker: more on anti-spam
In response to my last entry about anti-spam measures and the difficulty of blocking SPAM at the SMTP protocol level I received a few responses. Brian May pointed out that the <span style="font-weight: bold;">exiscan-acl</span> feature of <span style="font-weight: bold;">Exim</span> allows such blocking, and Johannes Berg referred me to his web site <a href="http://johannes.sipsolutions.net/Projects">http://johannes.sipsolutions.net/Projects</a> for information on how he implemented <span style="font-weight: bold;">Exim</span> SPAM blocking at the SMTP level.<br /><br />It seems that this is not possible in Postfix at this time. The only way I know of to do this in Postfix would be to have a SMTP proxy in front of the Postfix server that implements the anti-SPAM features. I have considered doing this in the past but not had enough time.<br /><br />Also a comment on my blog criticises SORBS for blocking <a href="http://tor.eff.org/">Tor (an anonymous Internet system)</a>. As I don't want to receive anonymous email and none of the companies I work for want to receive it either this is something I consider a feature not a bug!