newsletter services banning some SG domains

[brd]

I've noticed when I sign up for a blog's newsletter and they use a service like aweber or mailchimp, those mailing list companies reject some SG domains.

Just now with mailchimp, it shot down spamgourmet, mycleaninbox, a-bc.net and maybe one more. (antichef finally worked)

It seems like at some point, they will have all the SG domains banned. I guess I don't really have a question. Just