Rescue from failing drives #24146691

I have various accounts, all of which are POP3 not IMAP. The simplest I tried is BT Internet (incoming and outgoing server mail.btinternet.com, logon just requires user name and password but not secure password authentication. Outgoing SMTP server requires same password authentication as incoming. Incoming POP3 server uses port 110, outgoing uses 25. I've also tried to replicate settings for other accounts I have including one that is hosted using my domain name. I don't use Gmail. I seem to have exhaustively tried all combinations of the mail alert settings in FrontView. As we already discussed, once upon a time I was receiving email alerts but they ceased. This may have coincided with when I switched ISPs from O2 to BT, switched routers or switched firewalls, but I don't know so I am guessing at causes. For example, is the message transfer agent that sends alerts a specific executable program that I need to grant my firewall permission to access the internet?