ZCS 4.5.11 on FC4 (I know it's older, we are planning an upgrade soon).
Server has the correct time. The time in webmail is correct. I check all my servers, they have the correct time.
If email is sent internally (from one ZCS account to another), the time is off by an hour. An email sent at 9:30am will come into my mailbox at 10:30am etc.
If I logon to an external email (like gmail) and email my zcs account - the time is correct.
Any thoughts? I've rebooted the server, verified that the time is correct etc.