Hi,
This is the emailing service I am using:
https://www.fastmail.com/
The DNS records direct all mail to them, which they then process.
I actually have a ticket open there right now.
Is it possible for you to provide me with the precise message you received so I can hand it to them while I have their attention?
I think the ticket will self-close soon.
Thank you,
KB
Hopefully, they will then tell me what errors I might be making. Thank you.
KB