Not every new Pro Sites user get login info/welcome email


I have been testing the site registration process for new users using different emails from different PC's and notice that a few times that the login info/welcome email doesn't get generated.

For example with these two users:
New User: nessie
Remote IP:

New User: yandex
Remote IP:

This is kinda odd but also problematic.

Support access is available should it be necessary.