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Fill the $Sender property with the email address you wish to have as the Return-path
E.g.
$mail->Sender="[email protected]";
This property can be found on Line 97 in the class.phpmailer.php file
/**
* Sets the Sender email (Return-Path) of the message. If not empty,
* will be sent via -f to sendmail or as 'MAIL FROM' in smtp mode.
* @var string
*/
public $Sender = '';