Custom domains.

An email address on your own domain can remain part of your identity while the underlying mailbox service changes. That flexibility depends on control of the domain, a suitable receiving service, and an arrangement someone can maintain. Treat domain access and mailbox access as related responsibilities with their own recovery requirements.

The custom domain email overview introduces those choices. The domain email DNS guide explains how routing and authentication records fit together. Use the articles before connecting a new domain or moving an established address to another host.

Identify the authoritative DNS operator and preserve the current configuration before making changes. Create destination users and important aliases before redirecting incoming mail. List every legitimate system that sends using your domain, including services outside the mailbox provider. Verify incoming messages, replies, and automated mail separately so a successful test in one direction does not conceal an unresolved part of the arrangement.