I have one RedHat 5.9 64 Bit with Zimbra 7.1.1.
Some times, the internal mail between users is delivered in delay of 12/16 hours.
All workstations have Windows XP, I tried to update the client to 7.2.1 but the problem persists.
Tracing messages, the server will hand over properly on the mailbox in the correct times. But the client does not report the arrival.
Has anyone had any similar problem?