fix_phpmailer_messageid( PHPMailer $phpmailer )
Correct From host on outgoing mail to match the site domain
Parameters
- $phpmailer
 -  
(PHPMailer) (Required) The PHPMailer instance (passed by reference).
 
Source
File: wp-includes/ms-functions.php
function fix_phpmailer_messageid( $phpmailer ) {
	$phpmailer->Hostname = get_network()->domain;
}  Changelog
| Version | Description | 
|---|---|
| MU (3.0.0) | Introduced. | 
    © 2003–2021 WordPress Foundation
Licensed under the GNU GPLv2+ License.
    https://developer.wordpress.org/reference/functions/fix_phpmailer_messageid