Forum OpenACS Development: Re: SMTPS for outgoing mails
The NaviServer smtp module does currently not help, since it supports currently only plain text. I have no experience with the nginx module, but both approaches require integration with acs-mail-lite.
This was suggested by Maurizio Martignano some time ago, and looked like a good idea, because it moves the problem from the application to plain system administration.
I'm using postfix too as local smtp server and TLS tested. So if your client are allowed to admin an email server I think that's the best option
(I did not manage to get tcllib/tlctls to work with the client's mailserver, most probably because of issues with their "custom" certificate chain; connection testing via openssl and gnutls did work in the end, but only when pointing them to the right certificate etc... Anyhow, as using Postfix with all its bells and whistles seemed to me as the more convenient option anyway (one can easily inspect the mailqueue, has nice logging of the mailserver-communication, etc...), I decided to not go further down the tcllib road.)
Thank you all for your input!