FormMail-clone.cgi cPanel

One of my customers is using FormMail-clone but when I submit the form it give the error:

Sorry I can't send to xxxxxx@xxxxx.com.br. Is xxxxxx@xxxx.com.br on this server ?

And the domain is on the server.

Whats wrong ? I am running WHM 10.3.1 cPanel 10.4.0-E167

 

 

 

 

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