Delivery reports and read receipts in PHP mail

Question

Does anyone of you know off by hand what mail headers to add in order to get a read receipt and delivery report? This now being when you use the normal PHP mail function. No

Answer 1

What you could also do is embed an img (assuming that you're sending the email as text/html) tag that has in its source the following:

where tracking.php is a file that would be opened when the email is also opened (assuming images are activated) and then you can catch on your side the parameter id and check it against a stored id (database or file).

I am doing this for a newsletter manager to count the number of views.