No access to IMAP or POP accounts (Comcast again?)

No access to IMAP or POP accounts (Comcast again?)

This seems to be a return of the problem that emerged late last week with Comcast connections.

No IMAP or POP account access  as of ~10:00 AM EST today.

Same error message:  Connections to the server “imap.zoho.com” on the default ports timed out.

Internet service is Xfininty/Comcast, in Western Massachusettes.  Internet service seems fine, and I can access web mail, but Mac Mail utility is once again unable to access or deliver messages.

Please help!