How do I force TLS/SSL for SMTP authenication?

[Ying HaoM]

Hi,

I'm finishing up the installation of our Plesk 10.2 Ubuntu 10.04 machine. One of the things I want to do, is disable all unencrypted authentication. I've succeeded for everything except SMTP (Qmail).

Obviously, I can't close port 25 and force use of port 465, because then mail delivery will break.

I've tried all sorts of environment variables I could find in /etc/xinitd.d/smtp_psa, but nothing works.

Postfix has a smtpd_tls_auth_only option, but I can't seem to find it for Qmail, nor where to set it in the plesk-installed version.

Any help is welcome.

 

[Ying HaoM]

I found out I could just run /opt/psa/admin/bin/autoinstaller and replace Qmail with Postfix. With postfix, I enabled smtpd_tls_auth_only and it's done.