exim-gpg-filter

Exim4 transport-filter to automatically and transparently encrypt outgoing emails for all recipients

Install:

cd /etc/exim4
git clone https://github.com/Interoberlin/exim-gpg-filter.git

Open /etc/exim4/exim4.conf and append a transport_filter line to the remote_stmp section:

remote_smtp:
  debug_print = "T: remote_smtp for $local_part@$domain"
  driver = smtp
  transport_filter = /etc/exim4/exim-gpg-filter/gpgfilter.py

Fre software under the terms and conditions of the GNU Affero GPL v3.

interoberlin/exim-gpg-filter