Thunderbird Help!

[Duke 0]

Ok so i've used Mozilla Thunderbird for about the past two years with no problems at all. This evening however I open up and start trying to reply to some emails and I get this error. It's crazy! I've tried using different accounts, sending the message instead of replying, going through all the settings - I can't find anything!

 

It's horrible because I have absolutely no idea what caused it and can't send any emails. All my accounts are IMAP accounts.

 

 

Help, please, anyone?

[Sonic 296]

I'm not familiar with Thunderbird, I've never used it. Have you tried Googling the error message?

 

Perhaps re-installing Thunderbird may help.

[Doctor Destiny 41]

TLS; Transport Layer Security. IE you don't have the right credentials.