Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I administer several computers that have Thunderbird installed. I know Thunderbird has an option to require all email to be encrypted. However, I would like a way to allow unencrypted email normally, but require encrypted email to certain contacts.

For example, if I email, Thunderbird should require encryption, but if I email Thunderbird would allow unencrypted emails.

Are there any settings or Add-ons that would give this functionality?


share|improve this question
up vote 1 down vote accepted

I use open-pgp on thunderbird. Theres a setting in there for per recipient rules. I think thats what you're after?

share|improve this answer
That sounds like it might work. I will take a look. – Daniel Aug 24 '12 at 22:35
The OP seems to be asking about S/MIME encryption, not PGP/GPG. – MV. Aug 27 '12 at 23:57
I would still like a way to do this with S/MIME, however, your solution does solve my problem, so I will accept it. – Daniel Aug 31 '12 at 13:06

The add-on Security Settings from Address Book basically does what you described for S/MIME.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.