Solved with enigmail 2:1.7-0ubuntu0.14.04.1 from the ubuntu repository.
** Changed in: enigmail (Ubuntu)
Status: New = Fix Released
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https://bugs.launchpad.net/bugs/1219090
I tried enigmail 1.5.2 from https://www.enigmail.net/download/ .
I had to reload the mails, but decryption is working!
Please add a new version to the repository.
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