Configure Mail for a received/read receipt?

Mac Mail does not support that feature.

No, there is none for e-mail.

There was this method to request a read receipt by altering the headers, but I don't know if it still works.

However, it doesn't guarantee the recipient's email client will respond.

Mail does not respond at all nor provide you a way to detect that a read receipt was sent.

http://email.about.com/od/macosxmailtips/qt/et_request_recp.htm

Note that it isn't a per-message solution. It will send every email with the request.

Essentially, that's what the link I posted describes.

It isn't a feature of Mail. It's just forcing all messages to contain a header that requests a read receipt.

Mail has no functionality that supports creating or responding to read receipts.

Mail doesn't support read receipts as others have mentioned. Do you use Gmail or Google Apps on your Mac? If so you can use 3rd party email tracking services. Companies like ContactMonkey offer email tracking for Gmail & Google Apps. You get to see if your email has been opened, how many times, where, etc. The recipient doesn't know the email is being tracked. Whereas other services like Boomerang offer more of a traditional read receipt. The recipient gets a popup telling them the email is being tracked and whether it's ok to tell the sender it was opened.

Check 'em out and choose your flavour!