Since so many people seem to be having trouble with mail functions - although the server itself is performig perfectly with regard to mail - I have set a special Test category and you can initiate topics there by sending email to the special address:
jackrail.test@jackrail.space
Please note this is not a .org domain which has somehow got stuck in people’s minds.
When having suspected issues, please try that first, and then contact me if problems persist.