I have a cloud server that where I host a few web sites. I'm using Apache and WHM control panel. I'd like to close my server to send emails if the php scripts is not PHPMailer script?
I want to let my users send email only with phpmailer. ( with a connection to a related mail account using an email address and its password ) I don't want a hacker abuse my php web sites to send their spam emails.
where can I change this settings?