Blocking Emails except to own domain/gmail

[Yossi]

Hello,

How can I block outgoing mail from the domain, except for a particular E-Mail address, or limit the sending from the domain per hour?
I want to use external servers (only), otherwise the Emails should be dropped - unless a particular Email was used. Like an Email whitelist.

Some users are abusing our outgoing mail :/

Thanks a lot,
Yossi

 

[cPanelMichael]

Hello,

You'd need to setup a custom Exim system filter rule if you want to filter outgoing email leaving the cPanel server. Documentation on how to utilize the Exim system filter is available at:

How to Customize the Exim System Filter File - cPanel Knowledge Base - cPanel Documentation

Thank you.