Problem this snippet solves:
We wrote an external SMTP monitor to work around K99840695. It moderatly customizable, supports STARTTLS and has builtin support to test content filtering via EICAR/GTUBE.
The code is on Github, auto-generated releases are on the project's [https://github.com/hreese/f5-smtp-monitor/releases](release page).
Tested this on version: