Earthlink pop email setup problem

[cwaldron]

I have entered the pop email setup for my Earthlink email account. Zimbra Desktop is reporting "server not found" with the port 587 Earthlink provides. When I do not enter a port, Zimbra finds a certificate it says cannot be verified. Are there known issues with Earthlink mail setup? I will also contact Earthlink but just wanted to check if anyone else had this problem.

BTW I was able to setup gmail as my primary account and it is working no problem.
thanks for any advice,