Name.com offers email through cPanel.
I think I must have screwed it up when I made some configuration changes at the end of September which I didn’t precisely log 
. Currently can’t telnet to the server.
I rebuilt with ./discourse-setup which didn’t help, and I’m just not seeing anything odd on the cPanel or Name.com side. I wonder if I screwed up the DKIM/SPF incantation. I’m going to look there next.