When you say:
Do you just mean you double checked the option in gmail web-client settings? There could be something wrong with their user DB/LDAP (however they store account attributes). Have you tried connecting via another IMAP client?
Originally Posted by drdrem
Better yet if you have a *nix box type:
openssl s_client -connect imap.gmail.com:993
Do you still get that ALERT message back/can't connect in another thick-client? Time to talk with google's support - then come back to Zimbra Desktop of course
If you can already use another IMAP client with your account my apologies, I just didn't see you state so.