wp_mail recipient array not sending?

There are multiple ways of doing this.

You can consider any of the following.

1.My preferred:

foreach($group_emails as $email_address)
{
   wp_mail($email_address, 'my subject', 'my message', $headers);
}

2.Another way

Define the array as follows.

$group_emails = array('[email protected]', '[email protected]', '[email protected]', '[email protected]', '[email protected]', '[email protected]', '[email protected]', '[email protected]', '[email protected]', '[email protected]' );

And then try your regular procedure:

wp_mail($group_emails, 'my subject', 'my message', $headers);

I am not sure about the second way. But the first way will work for sure.