Thunderbird trunk + enigmail nightly
OpenPGP addon for Mozilla Thunderbird
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Installing Thunderbird trunk and enigmail nightly, thunderbird wont send any mail no more until enigmail is disabled. Receiving mail and decripting mail works.
I fixed the error, but I dont expect you will be more happy now. I expect you'll get Thunderbird crashes now, due to some non-found CSS.
I strongly disrecommend from using Enigmail with Thunderbird Daily - there are too many changes to follow them in reasonable time.