Per PHPMailer Manual, you sould use the method AddEmbeddedImage
$mail->AddEmbeddedImage(filename, cid, name);
By using this function with this example's value above, results in this code:
$mail->AddEmbeddedImage('my-photo.jpg', 'my-photo', 'my-photo.jpg ');
like this:
$mail->AddEmbeddedImage("rocks.png", "my-attach", "rocks.png");
$mail->Body = 'Embedded Image: <img alt="PHPMailer" src="cid:my-attach"> Here is an image!';
so cid:my-attach
will be replaced with the inline-source of the image that's inside the email body
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