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Thunderbird cannot connect to smtp server, but gets incoming via pop3
Yesterday Thunderbird started failing to connect to my smtp server. It does connect to the pop3 server and get emails. I turned on smtp logging in Thunderbird and only see a message stating it is attempting to connect to smtp server. No error messages. No changes were made to Thunderbird.
I assume either NIS or Windows is blocking access. I checked the settings for Program Control and Thunderbird is listed. Only thing I remember is Windows Update installing something a couple of days ago when I shut down. Does anyone have any ideas on what to look for?
BTW, I attempted to turn off scanning of outgoing messages in NIS but still got the same result. Also, disconnected router from ISP and reconnected.