after searching a lot and viewing log files i found out that the server is dropping connections from our ip, because we have to much open conections.
it is not possible to limit the imap-connections in our mail-client so we have to pimp up the value and allow more connections.
so what i've done is:
zmprov ms servername zimbraImapMaxConnections 10000
zmprov ms servername zimbraImapNumThreads 10000
The values are really set, i checked it with "zmprov gs" but still the same errors.
What am i doing wrong?
Its Ubuntu 12.04lts
thank you very much for any help