This morning I decided that since I was graduation (wahoo!) and my email account wouldn’t be working soon, I should migrate to a new server. Never have I had so much trouble with it. I could connect through an unsecure connection, but as soon as I turned on encryption, the connection would fail silently. I restarted, I changed settings, I googled, but to no avail. Then I noticed the “Error Console” in Thunderbird. I opened it up, and it turned out one of my extensions (the Remember Mismatched Domains extension) had a bug and was causing problems. The solution: disable the extension and restart. Once Thunderbird had a copy of the certificate on hand, I re-enabled the extension, restarted, and things worked as expected. I should probably file a bug report.
4 Comments to Mozilla Thunderbird Extension Hell
DougApril 26, 2007
They let you forward email, but you can’t keep it there. The alumni office also gives you an email address, but I don’t know whether they let you keep your email there.
Doesn’t matter. This way I have total control over my email on what is probably a more reliable system.
“I should probably file a bug report.”
Consider it filed 
Which version of RMD were you running and on which OS? Was the error console reporting something about “too much recursion”?
There was a Linux / Mac bug introduced in the Mozilla codebase that was causing an issue similar to what you describe:
http://www.andrewlucking.com/archives/2006/11/me-and-my-big-mouth/
The good news is that the 1.4.x version of RMD works around this for Linux users:
http://www.andrewlucking.com/archives/2007/03/rmd-14/
DougApril 27, 2007
It was 1.3.4 — upgrading to 1.4.3 fixed it. I assumed I was up-to-date through automatic updates, but I guess not.
It’s the exact same problem as the 1.3.3 problem given in your first link.
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April 26, 2007
Your school won’t let you keep your email address forever? I thought colleges allowed that in order to encourage stronger alumni bonds.