How to Allow Outbound SMTP in CSF Firewall via WHM/cPanel?

Some users might not be able to send emails after installing the CSF Firewall program. This problem is particularly prevalent among WordPress users, and it may be fixed by using WHM to enable outbound SMTP for the CSF Firewall.

To Allow Outbound SMTP in CSF Firewall

1. Log in to your WHM root account.

2. Access Plugins from the menu.

3. Click on ConfigServer Security & Firewall.

The CSF application will open.

4. Select the csf tab and click the Firewall Configuration button in the csf- ConfigServer Firewall section.

The ConfigServer Firewall’s configuration interface will appear.

5. Select the SMTP Settings section and click the Off switch for the SMTP_BLOCK field.

6. Scroll to the end and click on the Change button.

It will save the changes you made.

7. Click the Restart csf+lfd button.

It will restart the CSF application and apply the changes you made.

With this, the CSF Firewall will stop blocking all the outgoing SMTP for your WHM/cPanel server.

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