I got a personal website hosted at OnMatrix but their support sucks bigtime, now I want to transfer the domain to GoDaddy hosting service.
The GoDaddy hosting guys says that they will mail to the admin contact of my domain to confirm that I own that domain. But the problem is when I registered my domain with OnMatrix, I gave an email address which I no longer use. (it's from my previous cable modem company) I tried to contact OnMatrix folks about it, but no help.
Learn your domains real registrar at first. I think onmatrix is just a domain reseller. So they are working with a registrar. Then contact with the domain register and send them a copy of your identity card via email.
They will change the email adress for you to new one.