Hi Zoho, We've been having this problem over the last several weeks, and it's hindering people from getting important emails from me.  We're using Mac Mail on Yosemite.  I'm using your recommended settings for IMAP as well. 

Thanks for your help.

Ben

"There may be a problem with the mail server or network. Verify the settings for account “ xxxx@xxxx.com” or try again.

The server returned the error: Connections to the server “imap.zoho.com” on the default ports timed out."