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Catch-all and subdomains
Catch-all
With catch-all on, every address at your domain works. Not just the ones you made: any address, immediately, with the alias created the first time mail arrives for it.
This changes how you use the service. You stop going to a dashboard to make an alias. You invent one at the point of use:
plumber@yourdomain.comon a form, without opening anythingvetsurgery2026@yourdomain.comwritten on a piece of paper at a countertheregister@yourdomain.comat a newsletter signup
Every address tells you who leaked it, forever, without any effort.
The catch
Spammers guess addresses. With catch-all on, info@, admin@ and
sales@yourdomain.com all exist, and they will all get mail.
Two mitigations. Auto-create rules let you accept only addresses matching a
pattern, so you can require a prefix like x- and ignore everything else.
Failing that, delete the junk aliases as they appear; each one you delete is
refused permanently afterwards.
Most people run catch-all with a pattern. Unfiltered catch-all on a domain that has ever been public gets noisy.
Auto-create rules
A pattern that decides which invented addresses become real aliases. Anything that does not match is refused at the door and never becomes an alias at all.
This is catch-all with a bouncer, and it is what makes catch-all practical.
Subdomains
You can also claim a subdomain on our shared domain, giving you
anything@yourname.alias.mom without owning a domain at all.
It behaves like a catch-all domain, and it costs nothing. What it does not give you is the portability, which is the main reason to own a domain in the first place. If we vanish, a subdomain vanishes with us.
Think of it as catch-all for people who have not bought a domain yet.
Something here wrong or missing? Tell us. These pages live in the same repository as the code, so a correction is a one-line change.