On Thu, 7 Sep 2006, M. Dorcean wrote:
Totally new to mailman. Want to know if anyone can help me with fixing a
problem on mail server. Basically, user A sent an email on Aug 24 to user B
and user B is saying that he has received it again recently. User B mentioned
that this re-sending of mail has occurred in the past.
It might not be mailman, but also could be your mailserver, his mailserver
or some intermediate mailserver causing the problem. The only good way to
troubleshoot this IMO is to have him send you both duplicate copies _with
all the headers_ next time it happens (usually there's a "forward message
as attachment" option that forwards the message with headers intact).
Until you have that, you don't even know where to look (not to mention
what to look for).
Once you have those, if all the headers are identical then either there's
a bug in his mail program and/or pop/imap server and/or his MDA or he's
just imagining the problem. If headers are the same (starting from the
bottom) up to a point but then start to differ, the problem is most likely
on the machine that generated the last headers that were the same in both
copies. If the headers are entirely different, then these are 2 different
messages with the same contents, not duplicate messages.
Once you figure out where the problem is (and assuming it's on your
machine), you can grep your mail server logs for the (E)SMTP id your
server stuck in the headers; this unique number should appear in all of
the log lines dealing with that message. The log entries probably have a
hint as to what's happening.
Alexey
