> Why do you believe that your server is an open relay, as in, it > will forward messages FROM spammers TO remote destinations. > Wietse
Because it *is* accepting messages from outsiders (spammers) and is using my server to relay those messages to remote destinations. It was (and still is) my understanding that such messages should be rejected by Postfix during the SMTP dialogue, with an error to the client saying relay access is denied -- though I assume I inadvertently either failed to enable this check or have somehow broken it. I've run several open relay test sites on my server, and all of them claim it is clean, but I have seen numerous mail queue listings with such messages clogging up my system because the destination sites are correctly identifying them as being relayed and won't accept them. I didn't think such messages were supposed to make it into the queue, but should instead have been rejected by me with an SMTP error sent back to the sending client. One of these incidents, btw (two weeks ago), created a mail queue of over 50,000 messages before I noticed it and cleaned up the mess. It took about a day after that for my server to get taken off the GBUDB blacklist site. The next time I see this happen -- could be tomorrow, could be weeks from now, I have no idea when -- I'll gladly forward a copy of my "mailq" output. I deleted my earlier evidence, I'm afraid. Rich Wales ri...@richw.org
