As you probably know, Mailinator has a always-growing list of alternate domains. However, those are just the domains sponsored by us.
In truth - Mailinator accepts ANY email you fling at it***. In other words - you can setup your OWN personal domains simply by setting your MX record (i.e. through your registrar or DNS server) to point your mail delivery to Mailinator!
Simply put - if you own dinkybutt.com, you can simply change that domain's MX record to point to mail.mailinator.com and all email you send to dinkybutt.com (i.e. firstname.lastname@example.org) will then end up in Mailnator.
You can publicize this fact - or you can keep your personal alternate domain a secret and have your own private Mailinator !
***pursuant to normal draconian Mailinator email rejection criteria including but not limited to hate email, unlawful email, zillions of pen1s enlargement spam email (please.. get over it.. its not getting any bigger), or email that reminds of us bunnies. Have a nice day.