General :: Encrypt Using OpenPGP Certain Outgoing Emails On My Linux Server?

I am looking to be able to encrypt using OpenPGP certain outgoing emails on my linux server. Currently I have GPG setup with a public key, however encryption outgoing emails prooved to be harded.After a bit of research I have found GNU Anubis which acts as a middlemad between the MUA and the MTA, by encrypting emails before they reach my MTA (Sendmail)However I am having a bit of problem with the configuration of bind and remote-mta, as specified by anubis.I have the sendmail service running on port 25 and I want to leave it there, but I have configured my php.ini SMTP port to 24. So it runs through port 24 first and anubis then forwards the emails via remote-mta to port 25Here are my anubis configs:

bind localhost:24
local-mta /path/to/my/sendmail
remote-mta localhost:25

With all those set, I can't seem to get the basic modication of emails to work. (trying to change a certain subject to something else, just to see that anubis is working). However emails are still working with port 24 as the SMTP port.