When running OK normally - (without protection) - Server setting listed as imap.mail.netcenter.com" with port -143. This works OK.
I was guessing it might be in way the server name is written when changed by Avast, but haven't yet figured out the correct way.
Not sure whether to change .ini file - or whether to contact Netscape to find out if Server is different.
Thought someone else may have some ideas.