When I tried signing up for the SNL app a few years ago with snlnbc@[mydomain.com], and then [randomnickname]@[mydomain.com], it failed, but then worked with a

When I tried signing up for the SNL app a few years ago with snlnbc@[mydomain.com], and then [randomnickname]@[mydomain.com], it failed, but then worked with a GMail address. Which is all kinds of ironic, because I'm old enough to remember when free emails like hotmail.com and gmail.com were rejected by a lot of sites!