Making a Gaia e-mail

I know that there was a way to make an e-mail address that ends showing the domain as @Gaiaonline.com.

Does anyone know how?
I've been told a few methods that don't work at all, mostly using MSN and Gmail.
I would greatly appreciate the help.

PM me if you don't want to post it in public. <3
Thank you all.

You can't make a Gaia Online email. When somebody sends an email to email@gaiaonline.com, their server handles the delivery.

You can spoof the From address in the email header so that it appears to have come from email@gaiaonline.com, but you can't actually have a proper email.