You could also configure this in Postfix, by using a policy server or plain rules. Configure Postfix to add a header like "X-DoEncrypt: true" when your specified advanced rule is met, and then you configure Ciphermail to always encrypt by header trigger. One example is to do "X-DoEncrypt: false" when a sender match your specified "encrypt from" list, and then use a EDIT filter to edit "X-DoEncrypt: false" to "X-DoEncrypt: true" when a recipient match your "encrypt to" list. This can be accomplished by simple sender and receipient filters inside Postfix. If the sender does not match the encryption list, X-DoEncrypt: is never added, and thus the recipient filter wont encrypt the mail even if the recipient match the encryption list.

-----Ursprungligt meddelande----- From: Arie Koppelaar
Sent: Monday, April 06, 2015 10:38 AM
To: [email protected]
Subject: [Djigzo users] PGP email from selected users

Hi,

We primarily use CipherMail for PGP. When a PGP public key (of an
external email address) is imported, all email is automatically
encrypted to this email address. We want only specific internal email
addresses to send encrypted email to this external address.
Is it possible to achieve this without the usage of subject triggers,
because this manual action could be forgotten, and could lead into
unwanted situations.
Is there a way to configure this with CipherMail?

--
Groetjes,

Arie
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