Rated 5 out of 5 stars

Nice. It works. Thanks.

It would be nice if it would allow to add (and check) also the "@" part.

My use case: I'd like to treat "@gmail.com" as one domain, however "@lists.gmail.com" as other - warning required.

(Please note it's not literally for gmail.com, but you get the point.)

This review is for a previous version of the add-on (2.1).