DavidR
3
OK, I use thunderbird and I actually don’t have a yahoo.com email account, but I do have a btinternet.com email account and this is effectively handled by yahoo, so it may be the same setting requirements in your case.
See image, my btinternet account doesn’t actually appear in the avastUI, Real-Time Shields, Mail Shield, Expert Settings, SSL Accounts. What does are two occurrences of Yahoo.com:
one for Protocol=POP3 Port=110 and Encryption=None
one for Protocol=SMTP Port=465 and Encryption=SSL.
My thunderbird account settings for the btinternet.com accounts don’t have SSL and no secure username/password, etc. So try the settings I gave above and see if that works for you too.