For people having difficulties solving the Icedove - Enigmail - Thorbirdy
combination and the only help they find is this unresolved post:
https://trisquel.info/es/forum/need-help-gpgenigmailtorbirdy#top
Now it seems that the torbirdy help page have more details and advices about
difficulties of running torbirdy in Icedove (or Thunderbird).
Reading this five pages you can run Icedove - Enigmail - Thorbirdy without a
problem even with your disgusting gmail account.
https://trac.torproject.org/projects/tor/wiki/torbirdy
https://trac.torproject.org/projects/tor/wiki/torbirdy/preferences
https://people.torproject.org/~sukhbir/torbirdy-gmail.ogv (and excelent
video)
https://emailselfdefense.fsf.org/en/
https://www.enigmail.net/index.php/en/user-manual/signature-and-encryption