Aliases & Catch-All#

Aliases let one mailbox receive mail addressed to several different addresses. They are the simplest way to route mail for shared roles (sales@, support@, billing@) or to give a single person multiple public addresses without creating duplicate mailboxes.

Simple Alias#

A simple alias forwards all mail for one address to another mailbox on the same domain:

sales@example.com  →  alice@example.com

Mail sent to sales@example.com is delivered to Alice’s INBOX. Replies come from Alice’s address unless she configures a sending identity for sales@.

Multi-Destination Alias#

An alias can deliver to multiple mailboxes at once:

team@example.com  →  alice@example.com, bob@example.com, carol@example.com

Each recipient receives their own copy.

External Forwarders#

Aliases can forward to addresses outside the workspace:

alerts@example.com  →  oncall@otherprovider.com

External forwarders are subject to SPF / DKIM considerations — if the receiving domain enforces strict alignment, forwarded mail may fail authentication. Use Pulse for high-volume external distribution instead.

Catch-All#

A catch-all alias receives mail for any address at a domain that is not otherwise mapped to a mailbox or alias:

*@example.com  →  admin@example.com

Catch-alls are useful for capturing typos or disposable-address patterns but can attract large volumes of spam. They are disabled by default.

Plus Addressing#

All mailboxes automatically support plus-addressing (also called sub-addressing). A user with the address alice@example.com also receives mail sent to alice+anything@example.com. The suffix is preserved in the envelope so users can filter on it with Sieve.

Plus addressing requires no configuration and cannot be disabled per user — it is a property of the SMTP delivery pipeline.

Managing Aliases#

Aliases are managed from Mail → Administration → Aliases in the web UI, or through the Admin API. Changes take effect within one minute.

Limits#