Mail TIMEOUT

[newfield_no1]

When I look in my mail.log I see a lot of these massages:
pop3d: TIMEOUT,
imapd: TIMEOUT,
It is at all of my three Ispconfig servers.
The logfiles is now 9 hours old and this is the result of:
cat /var/log/mail.log | grep TIMEOUT | wc -l
Server1= 255
Server2= 30
Server3= 150

They all work but there is timeouts so customers has to wait for mailchesk some times.
The server is not overloladed as I can see in Munin.

Do some one has a clue?

All the server has Ispconfig 2.2.32 and is set up by Till.
It is Ubuntu 8.04 64 4Gb ram.

[till]

Are you really sure that customers have any problems with email? These timeouts occur when a customer is logged in with imap and his internet connection gets reset or ends before he has logged out from imap.

[newfield_no1]

It is mostly pop3d timeouts, but it was a imap customer that made me aware of the timeouts.
On one server there is:
87 imap timeout
196 poped timeout
The imap customer has seven mailaccounts that is checked from the same IP-adress.
The pop3 accounts comes from a lot of different customers.