Contactform7 using receiver email domain .co.ao

Guess it depends on how that email is being sent after Contact Form 7 sends it. Are you using an SMTP plugin?

The problem is not that.

The wordpress can send emails by mail() function without no problem.

But If I put the email [email protected] in the sender field the system gives me an error.

Only with the domain wavecom.co.ao

If I use other domain mail without two end point like gmail.com or wavecom.com it works perfectly.

Ok.