system
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OK, these are the new images. I have changed the yahoo.verizon.net line Avast SSL accounts to POP3 995 SSL, as you suggested. I have also changed the TB Server Settings to Connection Security None. In TB Server Settings I have the port set to 995. The default value is 110, but I get the same result (i.e., no e-mail) either way.
I am still working in the yahoo.verizon.net account, which is where I’m having the problem. Perhaps I confused the issue by bringing up other accounts. On TB I have a second account, yahoo.com, which is working. I use it to send test messages to the TB verizon account to see if I am making progress. (None yet.) I also have a Yahoo web page on which I can read e-mail from both accounts (verizon.yahoo.net and yahoo.com) without using TB. The test messages I send from one TB account to the other show up on the Yahoo Web page mail but not in the TB yahoo.verizon.net acct.
Is that confusing? I suppose it is.