Thunderbird doesn’t work since yesterday. Problem started yesterday after installation of the new program version. There are several accounts on some providers, nobody runs.
RSS-feeds run.
What avast program?
What firewall?
Avast Internet Security 2015, including Avast Firewall
Sorry, problem is solved.
Some spam-mail must have change my accounts. Maybe a mail with announcement of post or bank.
I switched it back to SSL/TLS and now it runs.
I will change my passwords