Adding custom headers to phpmailer

Hello,

There is some code that I would like to add to phpmailer but I am not exactly sure where to add it… I would like to add:

$mail->AddCustomHeader( “X-Confirm-Reading-To: my@email.com” );

$mail->AddCustomHeader( “Return-receipt-to: my@email.com” );

$mail->AddCustomHeader(“Disposition-Notification-To: my@email.com”);

This is for when emails are being sent from individuals in our organization, to request a “read receipt” from the client.

I am not sure in which file and where in the file I am supposed to place it.

Any help would be greatly appreciated.

Thanks,

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