I have used thunderbird for years.
Using the recommmended settings, it does not login.
I went to keychain and deleted all verizon internet passords entries in login.
I have tried both SSL and no SSL in incoming security and neither works. I have tried putting incoming and outgoing in settings and that does not change anything either.
I tried different ports with no changes.
I have reinstall it 2 x after deleting whole app on iMac OSx latest version.
Ideas?