List the addresses customers genuinely use and create explicit mailboxes or forwarders for them first. The domain default address is separate from cPanel’s system-user mailbox and is not a way to set every website’s outgoing From address.

1. Open Default Address and choose the correct domain.
2. For domains that should accept mail only for known recipients, select rejection during SMTP with an appropriate error message. This allows the sending server to report the invalid destination.
3. If a catchall is a deliberate business requirement, select forwarding to a monitored address with sufficient storage and a spam-management plan.
4. Save the change and test both an existing valid address and a made-up recipient. Use a sender outside the hosting account.
5. Review delivery results and monitor the catchall’s volume if enabled. Replace frequently used misspellings with explicit aliases when appropriate.

Valid recipients should continue receiving mail. Unknown addresses should follow the selected rejection or forwarding policy without silently disappearing contrary to your intention.

A domain-wide forwarder or remote mail provider can affect the outcome. Check Email Routing and authoritative MX records if this server is not responsible for incoming mail. Avoid silently discarding all unknown mail merely to conceal errors from senders.

It can collect unknown recipients, but it cannot provide separate logins or controlled access for each address. Use named accounts and explicit forwarding rules for normal business roles.

• Selecting Local or Remote Mail Exchanger in cPanel
• Tracing a missing message with cPanel Track Delivery
• Changing a mailbox quota without deleting messages
• Suspending a mailbox login or outgoing mail without deleting it

• cPanel: Default Address
• cPanel: Email Routing