Email clients unable to connect to Zimbra

[bhwong]

Suddenly, all our Email clients are not able to connect to our Zimbra Server. This includes Outlook, Zimbra Desktop and even our Canon Copier scan-to-email function.

The web client is still functioning, but calendar appears to be freezing.

We have restarted Zimbra services and even reboot our server. What could be the possible cause???

[moetiker]

o Certificate Problems?
o The entries for the MTA Networks get lost. ( zimbraMtaMyNetworks )

[bhwong]

o Certificate Problems?
o The entries for the MTA Networks get lost. ( zimbraMtaMyNetworks )

The problem was solved. It was actually caused by our firewall! :P
But I still appreciate your helpful response!