Jason Bailey, Sun Advocate Webmaster put forth on 6/22/2010 10:32 PM: > (Note: I do have to disclose one piece of information. Recently our > server was automatically blacklisted by our ISP for spam that was being > relayed through our system from a series of external sources. I've > tested both servers against online open relay tests and performed my own > internal tests at times to prevent relay of spam, so I can't say why > they were able to relay. I ended up basically rewriting the > smtpd_client_restrictions, smtpd_receipient_restrictions and > smtpd_sender_restrictions lists. The relayed spam stopped and our ISP > finally removed us from their blacklist)
If the problem you describe started after this blacklisting, and you had none of these delivery problems before said blacklisting occurred, doesn't it seem pretty obvious that what you are seeing are residual effects of said blacklisting? Apparently the recipient domains in question have added you to their own internal black lists or other filter database categories (i.e. manual spam scoring of your domain in SA). You need to contact them--all of them--directly. -- Stan
