For a reference, here is the description of this feature: Using the Forum Via Email.
Thanks. Considering the note about Creating new topic via email:
Note: to use this you need to be at least trust level 2. This means you must have been spending a bit of time on the forum. But if you’re an email-only person and have been relatively active replying, please notify the moderators so we can review your trust level.
it seems the previous suggestion that tl1 was sufficient doesn’t seem to match.
Personally, I am an email person and I use the forum from a very old and slow computer (until I learn to set up everything on my Qubes OS system) on which running JavaScript is a performance nightmare. So, I hope for moderators understanding to fix my trust level 