Configuring cPanel spam filtering and the Spam Box

Plan to review the spam folder regularly during tuning. A lower threshold generally catches more messages but can increase false positives. Keep important senders and the mailbox’s business purpose in mind before enabling automatic deletion.

1. Open Spam Filters in cPanel and review whether processing and spam marking are enabled. Turn on the available processing control if needed.
2. Review the spam-score threshold and start with an appropriate conservative setting. Change one setting at a time so you can understand its effect.
3. Enable Spam Box or the option to move new spam to a separate folder where available. Confirm that your mail client can display and synchronise that folder.
4. Leave automatic deletion disabled while testing unless you intentionally accept losing matching mail. Check any separate auto-delete threshold rather than assuming the marking threshold deletes messages.
5. Monitor legitimate and unwanted mail, then adjust filtering or a narrowly scoped allowlist as evidence requires.

Inspect real message headers or the server’s available spam result and confirm suspected messages reach the intended folder. Recover any false positives promptly.

If legitimate mail disappears, review Spam Box, auto-delete, global filters and mailbox-specific filters together. Raising a mailbox quota may help a full spam folder but does not fix overbroad filtering. Do not broadly allow every sender from an untrusted domain to solve one false positive.

• Using BoxTrapper without losing legitimate email
• Creating a global email filter in cPanel
• Creating a filter for one cPanel mailbox
• Deleting a filter from one cPanel mailbox

• cPanel documentation