I've been using various emails on a personal domain for different sites. Some time this year Six Flags put in an email check and I can't register my season pass anymore. They give the following error:

We were unable to finish validating your connection with the "*.net" email server.

Yet I've been signed up for the pass holder announcements and get the email on a regular basis.

I had a .to domain for a while, and I had an email address "[email protected]" where firstname is my first name. I wanted to use it when I needed to give out emails causally, like if someone from Church or some other group wanted my email.

I gave up on it, not because of computer validation but because of stupid people! Nobody would "get" the .to domain and they'd always think there should be a .com or .gmail.com on the end of it. Especially older people.

So I gave it up.

I'm discovering the same problem with my *.xyz domain name.

As a counterpoint, I was surprised to see we've had very little trouble with our *.solutions domain, even from clients who are otherwise not very tech-savvy.

I sometimes have to repeat my @.ws email address more than once when reading it to someone, but I've never had a problem with anyone messing it up or thinking it's invalid.