Email Notification authentication

[chemlud]

Slightly OT: I use a raspberry pi configured as a fake email server (only for receiving status emails from firewalls and NAS etc). Access from remote via VPN. Don't want my status emails with sensitive info to be floating through this interweb thing... ;-)

[NOYB]

I use a VPS hosted POSTFIX configured to only accept secure connections.  Either SSL/TLS or required STARTTLS connection upgrade.  Plus my router email notifications client configured to require STARTTLS connection upgrade.

In short.  Own email server and secure connection required.

[dcol]

I agree with everything NOYB said, I just got bogged down with two different issues.
The reason that the AUTH PLAIN was an issue is because I could not use SSL or STARTTLS because it doesn't work in OPNsense, which meant I needed to allow non encrypted authentication to make it work. But there is always a different approach and I used an obscure local port that does not require STARTTLS or SSL and that works fine until the issue is resolved.