PHP's Mail () function disabled in SMTP?

I'm experiencing problems with PHPMailer, the class version is 5.1 , which is generating the following error: Could not instantiate mail function error that corresponds to an instance problem.

So when I use it I get the following error:

  

Warning: mail () has been disabled for security reasons

In front of all this, I would like to know if the error generated, Could not instantiate mail function , is directly related to the lack of this function in php.ini .

obs: The MX server is configured for G Suite , so SMTP settings are from google gmail.