Instead of asking for a password every time you sign into Cpanel to access an email’s webmail interface. You could enable auto login for domain owners through WHM. To do so you would navigate to Tweak Settings > Mail > Mail authentication via domain owner password. And click “Enable”.
This will allow you to log into your cPanel account and access webmail without requiring a password.
Your email is still secured by the password you set but now you can easily access it with the click of a mouse through cPanel.