Blocking the formmail access.

Many of my clients using populer FormMail script to send mails from their pages. But I found out that they use some other domains to relay on this script too. So, they can call this script to send mails out. These domains are not hosted in my server.

I wanted to block this "abuse". How do I do this? I am thinking about to block sendmail as it not to send mails for the domains which are not hosted in my server.

Any solutions?

 

 

 

 

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