MSFT calls it Tracking but what does Apple Call it?

Question

You know when you send out an email and once the person at the other end receives they send an auto email that yes I got your email?
Anyone know what it's called for mail.app.
I've slowly done the switch over to using full mac at work and so far loving it.

Answer 1

I don't recommend it, but it can be done. Quit mail and run Terminal. Type this command and press return:
defaults write com.apple.mail UserHeaders '{"Disposition-Notification-To"="your@address";}'
using your correct email address instead of your@address.
All messages sent with Mail will now include the Disposition-Notification-To header which is the one asking for a return receipt.
If you wish to turn off this feature in the future, the Terminal command is:
defaults delete com.apple.mail UserHeaders
It is a hidden feature, and comes with several warnings:
use at your own risk
once you set it, it applies to all messages until you unset it
it can only be done from the terminal, with mail shut down
using it does not guarantee a response - some mail clients will ignore it, and many mail users will have told their clients to ignore it
AK