with settings correct, no new e mails are coming into the in box
with settings correct , no new e mails coming in. worked with my e mail administrator and discovered no new mails downloading to in box, but sending is OK. No errors coming up on screen.
Opaite Mbohovái (1)
are you using TLS/SSL conection encryption. Thunderbird 78 requires version 1.2 or higher of TLS. For some reason lots of mail administrators appear to have missed the web wide deprecation of these old version by Microsoft, Google, Apple and Mozilla. So you might want to check that.