Blog is getting too much spam, so they are restricting posts/comments from Gmail.com addresses.

That's ok, I understand the desire. I also recognize that it's a lazy "fix". I have my own domain and prefer that so I can track compromised sites.

In quasi-related conversation though, in the last year I have encountered 2 "necessary" websites (insurance, and medical form) that would only accept: Gmail, yahoo, outlook, etc addresses!

It's frustrating.