Author: Jakob Hirsch Date: To: bugzilla-daemon CC: exim-dev Subject: Re: [exim-dev] [Bug 404] New: Exim accepts message after sending
serverdisconnects
Quoting bugzilla-daemon@???:
> 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.
