Ingeborg Hellemo <[EMAIL PROTECTED]> wrote:
The problem we have recently discovered is that some distribution lists allows high scoring spam to be sent out. It then gets rejected by our mailserver and our users get unsubscribed from the lists as if we had returned "User unknown". I'm not very fond of silently dropping high scoring spam on the floor since any "real" senders will not be notified of their message not getting through. How do you handle this?
You must be referring to Listserv. Its standard message tells people that all 5xx errors mean "user unknown", that refusing mail for a valid user must be a system problem, that our mail server is unreliable, and that the user should consider another service provider. I send mail to postmaster and list owner. I ask whether THEIR server really delivers virus and spam to users, and if not, to stop libelling our university's IT department for refusing it. This is cc-d to our user. It sometimes gets action. I feel very strongly that nothing should be dropped. False positive is always a possibility however small. (OK, we do drop mail claiming to be from our own incoming service addresses like [EMAIL PROTECTED], since we know for certain that no legitimate mail comes from those addresses.) Joseph Brennan Columbia University Information Technology _______________________________________________ NOTE: If there is a disclaimer or other legal boilerplate in the above message, it is NULL AND VOID. You may ignore it. Visit http://www.mimedefang.org and http://www.roaringpenguin.com MIMEDefang mailing list [email protected] http://lists.roaringpenguin.com/mailman/listinfo/mimedefang
