Okay. Ich habe heute den ganzen Tag gebraucht um mein Problem zu lösen. Aber nun habe ich es geschafft. Falls es noch jemanden interessiert, findet sich unter http://enigmail.mozdev.org/support/troubles.php#flowed eine Beschreibung des Problems samt Workaroud.
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8. My own signatures are invalid!
Enigmail replaces ">" in quoted messages with "|"
Enigmail replaces leading spaces with "~"* These problems are caused by format=flowed (RFC2646).
DON'T use it with OpenPGP signatures.
* In Seamonkey, open a browser window to about:config, in Thunderbird, use the "Config Editor" button located on the General tab under Options --> Advanced and make sure that mailnews.send_plaintext_flowed is set to false. This is not really a bug, but a workaround that Enigmail uses to handle the text=flowed formatting used by Mozilla, which can invalidate signatures. You can avoid this replacement by setting the option mailnews.send_plaintext_flowed to false:* On Thunderbird: open the Config Editor (Tools > Preferences > Advanced)
* On SeaMonkey: open the URL about:config
Gruss Boson