How to Setup a Customy Mail Address for Your Domain?

This morning i woke up and i opened te mail. The castomimal address was now part of the sort of, you know how when you set up an alias for an icat mail address? And the customy mail address, it showed up like that after a few hours. So it, it looks like an alias, butit's not an alia. Sie acastoe ma address for your domain. Yes. This is interesting. I don't know why anyone would do this. It says, ad existing emal addresses all add all the emal addresses that you currently use with this domain. You'll be asked to verify this during set up. You can create nmale