Custom domains let you create aliases on a domain you own — so instead of shop@aliasfleet.me you get shop@yourcompany.com or whatever domain you've registered.
It takes a few DNS records and a few minutes to set up. Once it's verified, you can use the domain on any alias you create. Subdomains are supported too, so you can have mail.yourdomain.com alongside your root domain if you want.
This section covers adding domains, the DNS records required, understanding the status indicators, subdomains, and what happens if you remove a domain.
You need a Pro account to add custom domains.