Quoting [EMAIL PROTECTED]: > User started receiving multiple copies of same message. Headers showed that > it > was a single message that went from originating server to intermediary > server. > Intermediary server kept re-sending message to our server. Operators of > intermediary server say their logs show SMTP exchange was timing out before > our > server accepted the message, so it kept re-attempting delivery. Our server > seems to have thought it accepted the message but in fact the sending server > appears to have already timed out and disappeared before the message was > accepted.
I saw this before (and I think it was discussed once on the users list). It was caused by a firewall with short timeouts (60s) for its connection table. After the timeout it discards Exim's "250 OK" reply. The sender host's network admin raised the timeout (RFC recommends 5 or 10min) after I mailed this to him and it worked then. There's not much Exim itself can do about that, I think. -- ## List details at http://www.exim.org/mailman/listinfo/exim-dev Exim details at http://www.exim.org/ ##
