Yes, I intended to post to the list. I now see that if I use the archives to post (as I'm doing now), I have to use "reply all". On my Outlook, it's the other way around. If I want to reply off-list, I have to click on reply all and then remove the list address. Sorry. I only use the Gmail address for a few limited purposes.
I did set First Strip to a hard no. I' m going to have to think more about the unconditional DMARC. Given what you said, I may well cause more grief than I alleviate. Our list (lists.radg.us) has only about 60 members, but with a lot of different email configurations. Gmail, Yahoo/AOL, Hotmail and similar, academic .edu domains, corporate domains, email offered by ISPs, and personal domains like yours. I use two .us domains, one registered and hosted by TMD and one by Hostinger, because they were relatively cheap. I don't see any apple iCloud, but maybe that's because they use a domain alias.
Many if not most of the subscribers to RADG are not very IT savvy, so I suspect that using the archive for search or posting would also seem like a PITA. But I may suggest it after he cools down.
Thanks again for the help.
Steve B