I just installed Thunderbird a month ago, because something nullified Mailwasher. I use W7.
My problem is that I could send mail yesterday, but not today. The problem appears to be in the way it contacts the server. I noticed that the ports look funny.
For POP3, 935 is the port. For SMTP, it is 587.
Over the years, I've always thought these ports were 2-digit numbers (10 and 25, I think).
I feel sure my settings have been changed overnight. Thunderbird sent emails yesterday, but not today. I have changed nothing in the app's settings.
Though I can download mail, I think someone else also has access to it. But for sending mail, nada.
So, for Thunderbird, what are the default ports for both POP3 and SMTP?
I think knowing those port numbers would solve the problem. It won't keep the hacker from changing them again, but at least I'll know how to thwart them.