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

Hi,

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: 178.162.203.212
http://screencast.com/t/O7z3i0lZ211u

New User: yandex
Remote IP: 92.111.3.96
http://screencast.com/t/ChS7UhDvCN

This is kinda odd but also problematic.

Support access is available should it be necessary.

Thanks,
Justin