Phase 9: Create mailboxes, aliases, and catch-all delivery

9.1 Create a normal mailbox

Do not use the administrator account as a daily mailbox.

Navigate to:

Management
→ Directory
→ Accounts
→ Add Account

Create:

Primary email:
user@example.com

Administrator:
No

Quota:
5 GB or 10 GB

Use a strong, unique password.

Add addresses such as:

hello@example.com
contact@example.com
support@example.com
admin@example.com
postmaster@example.com
abuse@example.com
dmarc@example.com

All of these can deliver into:

user@example.com

The postmaster address is useful because DMARC and TLS reports will be delivered there.

A catch-all allows unknown recipients to reach the mailbox:

anything@example.com
receipts-2026@example.com
random-address@example.com

Set the domain’s unknown-recipient or catch-all destination to the primary mailbox or to an alias connected to it.

Catch-all delivery is convenient, but it increases spam because every randomly generated address becomes valid.

A safer alternative is:

Examples:

user+shopping@example.com
user+github@example.com
user+receipts@example.com

Ensure unrestricted SMTP relaying remains disabled. A mail server must never be an open relay.