On 2015-02-15 John wrote:
> A couple of the  servers I support are medical offices, and for
> patient confidentiality reasons they need to send email out
> encrypted.
> After a lot of discussion they have come to the conclusion that in
> order to avoid accidentally sending confidential data unencrypted,
> all email must be encrypted.
> What they would like is a filter on outgoing email that checks for
> encryption and refuses anything not encrypted. They need to err on
> the side of caution.

A couple years ago me and a friend wrote a proxy for a similar purpose:

http://www.planetcobalt.net/sdb/crypter.shtml

Run it as a daemon and configure it as a relayhost for your Postfix.

Regards
Ansgar Wiechers
-- 
"Abstractions save us time working, but they don't save us time learning."
--Joel Spolsky

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