Creating own @email domain

There are many websites which help in sending anonymous mails to expose corruption etc. But is there a way to send a mail say through proton mail but to the receiver it says [abcd@namesetbyus.com](mailto:xxxx@namesetbyus.com) and when the user replies to this mail, the mail comes back to the proton mail? The point is so that the receiver doesn't know that the mail was sent through proton mail.

anonymous back corruption domain email etc mail mails mailto own point privacy proton proton mail send websites