Hi, I've got a recently-occurring spam issue that I'm trying to solve. And apparently it's happening on two different servers running both sendmail and postfix. The issue is that someone is connecting from a remote system, claiming to be "from" my domain, and sending mail "to" my domain.
In other words, they connect to mail.foo.example claiming to be from: [email protected] and sending to: [email protected]. For some reason this is making it past my spam checks, and I don't know why. Strangely, this is happening both in postfix and in sendmail. It's quite annoying, and getting more.. "popular". Any advice from the crowd? I'm happy to share configuration data privately; on the sendmail side I *do* use relay_based_on_MX; maybe that has something to do with it? On the postfix side, I might need to explicitly disallow senders claiming to be from my own domain that aren't authenticated; I suppose I need to add "reject_unlisted_sender" to my smtpd_sender_restrictions? Thanks, -derek -- Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory Member, MIT Student Information Processing Board (SIPB) URL: http://web.mit.edu/warlord/ PP-ASEL-IA N1NWH [email protected] PGP key available _______________________________________________ Discuss mailing list [email protected] http://lists.blu.org/mailman/listinfo/discuss
