Members who have email addresses at me.com have email delivery failures I notice. I have seen this before. It is not an issue with this list, but something to do with me.com. Ironically the people who need to know this will not get this email, but hopefully they may log in to the web interface.
As with last time this occurred, a large amount of troubleshooting led nowhere. Nothing I can do I am afraid except to suggest using alternate email.
All the email for this forum goes out via Amazon Simple Email Service (SES) and this service has the highest possible reputation regarding spam houses and traps, and is the main reason I use it. There’s no current fault with SES either.