You can use CloudLinux Selector to enable the Mailparse extension in PHP via cPanel.

1. Log in to your cPanel account.

2. In the Software section, click on Select PHP Version.

cp cl select php version icon

3. Click on the Extensions menu.

cl extensions tab button

Note: If the Extensions page shows an error related to the native PHP version, change it to a non-native version first.

4. Checkmark the Mailparse. Once enabled, it will display a success message.

cl mailparse enable

The message will read that the module Mailparse is saved.