I have problem with sending and receiving e-mails in Thunderbird (31.1.1) under Avast Premier. I was able to receive mails, but not able to send it. I even deleted security certificate for that mail server, but with this I made it worse. For now only way to send and receive mail is to block Avast in that period. Then everything is working properly (except protection).
My question is how to make Thunderbird and Avast work together?
Hi and welcome.
You could take a look at this information, possibly it can help. 
http://www.avast.com/faq.php?article=AVKB91#artTitle
But how to import or export if I deleted that certificate?