A mailgate for Postfix to encrypt incoming and outgoing email with S/MIME and/or OpenPGP and decrypting OpenPGP encrypted emails https://lacre.io
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1) Ensure that GPG is installed and configured.
a) Make sure public keys for all of your potential recipients are
available in the GPG home directory you use in step 2
2) Configure /etc/gpg-mailgate.conf based on the provided sample config
3) Place gpg-mailgate.py in /usr/local/bin/
4) Place the GnuPG directory in /usr/local/lib/python2.5/site-packages
5) Add the following to the end of /etc/postfix/master.cf
gpg-mailgate unix - n n - - pipe
flags= user=nobody argv=/usr/local/bin/gpg-mailgate.py
127.0.0.1:10028 inet n - n - 10 smtpd
-o content_filter=
-o receive_override_options=no_unknown_recipient_checks,no_header_body_checks
-o smtpd_helo_restrictions=
-o smtpd_client_restrictions=
-o smtpd_sender_restrictions=
-o smtpd_recipient_restrictions=permit_mynetworks,reject
-o mynetworks=127.0.0.0/8
-o smtpd_authorized_xforward_hosts=127.0.0.0/8
6) Add the following to /etc/postfix/main.cf
content_filter = gpg-mailgate
7) Restart postfix.