name@CALLSIGN.com. An address every operator can remember from the air, on a domain that is yours.
Operators already know you by your callsign. Callsign email makes that your address too: name@YOURCALL.com, with whatever name you like in front of it. The domain is registered in your callsign, a station page goes up on it, and a real mailbox is created behind it. You do not configure a server, a DNS record or a mail host; that is all done for you.

Callsign email is part of QSL World Pro Max, and you choose it inside Ham Email: the name before the @, then the ending, from the ones still free for your callsign. Payment happens on qslworld.com in a private checkout window. Ham Email itself remains free; the plan is what pays for the domain registration, the hosting of your station page and the mailbox.
After payment Ham Email asks for two things: the password for the new mailbox, which the mail service checks on the spot, and the owner details the domain registry requires, filled in from your QSL World profile. The domain is registered, the page published and the mailbox created, and Ham Email adds it the moment it is live. From then on it sits beside any other mailbox you use, with the same search, the same conversations and the same rules about what leaves your computer.