[jefft@iri.columbia.edu]

Over the past 2 days, I have been seeing a problem that the Deferred mail queue starts filling up and no new mail is delivered locally.

A restart of Zimbra solves the problem, and the queue empties out immediately upon the restart (zmcontrol stop, zmcontrol start)

In the log files (zimbra.log) I see the following (with names changed to protect the innocent, of course):

>Jul 9 10:43:43 XXXXXX postfix/qmgr[10896]: 242AD90BE2D: to=<name@mail.host>, relay=none, delay=0.03, delays=0.01/0.02/0/0, dsn=4.4.2, status=deferred (delivery temporarily suspended: conversation with mail.xxx.xxx.xxx[nnn.nnn.nnn.nnn] timed out while receiving the initial server greeting

Not sure where to look for the problem. Can anyone point me to what I should be looking for? I don't think its a network problem, because as I said, a zimbra restart fixes the problem. And it only started happening over the past two days.

Has anyone run into this before?

Thanks for any help,