> As far as I know, most of the clients are going through a NAT gateway
> on a 2.2.x linux machine, and this is one of the things I suspect may
> be causing the problem by terminating connections abruptly.
>> So, has anyone else come across this problem in a mailserver, and
> if so, are there any quick solutions, such as increasing timeouts on
> NAT connections?
You could try tweaking the masquerading timeouts on the NAT box.
These timeouts need to be longer than the TCP keepalive interval
on the clients.
Also, I think the IMAP server will drop connections that are
idle, so you might need to get your IMAP clients to talk to
the server a bit more often (such as checking for new mail).
I've seen it happen with Outlook 2000 & wu-imapd. When the client
machine was heavily loaded (such as doing a large compile) these
disconnects happenned more often. And it's a decent client
machine, too... I just put it down to Outlook being plain stupid.
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