dovecot - Dec 2021 - Force clients to use pgp encryption when sending email?

> Basically I want the server to check if the message being sent is encrypted
with OpenGPG and either proceed or reject the message based on that criteria.

Postfix is your submission service so i think best to look that direction. If
there is a header you can check for (if the header exist then allow sending)
then postfix has header checks regexp/pcre that would be simple enough to setup.

On the more complex side, postfix also supports policy servers you can write as
a script (php, perl, python, etc) or you can go full on milter.


http://www.postfix.org/header_checks.5.html
http://www.postfix.org/SMTPD_POLICY_README.html
http://www.postfix.org/postconf.5.html#non_smtpd_milters

Thanks for that info! It?s just what I needed!
> On Dec 7, 2021, at 8:35 PM, dovecot at ptld.com wrote:
> 
> ?
>> 
>> Basically I want the server to check if the message being sent is
encrypted with OpenGPG and either proceed or reject the message based on that
criteria.
> 
> 
> Postfix is your submission service so i think best to look that direction.
If there is a header you can check for (if the header exist then allow sending)
then postfix has header checks regexp/pcre that would be simple enough to setup.
> 
> On the more complex side, postfix also supports policy servers you can
write as a script (php, perl, python, etc) or you can go full on milter.
> 
> 
> http://www.postfix.org/header_checks.5.html
> http://www.postfix.org/SMTPD_POLICY_README.html
> http://www.postfix.org/postconf.5.html#non_smtpd_milters