Update w/ Some Additional Info
I have learned today that it is not only POP3 that stops responding, but also IMAP. This morning, again, everyone's email stopped working.
This seems to occur about every 48 hours. At least for the past 10 days, every other morning no one can connect to mail.
Again, the only change I made was to upgrade from 4.5.6 to 4.5.11. (I guess in the future if something is not broke don't fix it; at least I have heard that somewhere before).
Unfortunately, by the time I realized it had happened again this morning, I had 20 customers and 3 employees p!ssed - so I did not troubleshoot too much. I just did the zmcontrol stop/start and everything started working fine.
Again, when this happens SMTP still works - I can SEND out mail. Just no one can receive mail.
Does anyone have any ideas at what to look at? Should I just open a ticket w/ Zimbra? Suggestions?