One is that you can put one or more dots within the name part, however you want, and it won’t affect anything. This is for regular Gmail users, and takes the form of “ The email domain in use.īefore we get to the other domains, here are two fun facts about using your domain. The most well-known domain for email is, of course,. The “” Domain: What most of us have for email Whether or not you use GMass, it’s useful to understand the difference between the three different domains that Google uses for email:, , and . Let´s take a quick look at how these three differ.