PHPMailer $phpmailer )
Fires after PHPMailer is initialized.
The PHPMailer instance (passed by reference).
The wp_mail() function relies on the PHPMailer class to send email through PHP’s
phpmailer_init action hook allows you to hook to the phpmailer object and pass in your own arguments.
This action is initiated with `do_action_ref_array` rather than `do_action`. You still hook to it with `do_action`. However, there are some notable differences:
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do_action_ref_array( 'phpmailer_init', array( &$phpmailer ) );