If you always want to send a read receipt, here’s how to set it in the Messages app. Further reading: Learn more about macOS Catalina In the Messages app, go to Preferences Accounts,.

Read Receipt For Mac Mojave Mail Address

Click here to return to the 'Be alerted to 'read receipts' in Mail messages' hint

I haven't done this; however, you can add a RULE that checks for 'Disposition-Notification-To' and highlights the message in some way. When you are in the RULES panel, select the 'Edit Header List...' from the pull-down menu. This allows you to add additional header items to the list of potential rule attributes.

that's nice, but since you're new to Apple Mail, maybe you like this trick even better:

1. Open Mail preferences
2. Select 'Rules'
3. Click 'Add Rule'
4. Click the pulldown that says 'From'
5. Select 'Edit Header List' (last entry)
6. Click the '+' symbol to add a header
7. Type (or paste :) ) Disposition-Notification-To
8. Tell the rule to ensure this header contains a 0 (zero), which will be true until the year 2111
9. Select an action to do, e.g. set the color of the message to red, or make an autoreply :)
10. save and apply
11. all done

I have to note that it does seem to forget about the extra header when you later try to modify the condition, but it keeps working (at least on Apple Mail 2.0.5)

Read Receipt In Windows 10 Mail

Sorry, I don't understand your #8. Are you suggesting that the rule should check if the Disposition-Notification-To header field contains a zero and if so performs the specified action (colors the message red/...)? I just dug around in my old e-mails to find one with such a header set (luckily I don't get many of these annoying things!), and there is just a line like this:
Disposition-Notification-To: foo@bar.com

So just a return address and no date, which makes sense to me, to be honest. Based on that, I would rather set the rule criterion to Disposition-Notification-To Contains @ (which should be valid even after 2110...).

Or do I misunderstand?

Stupid question is there a way, so that I can send those kind of emails 'Disposition-Notification-To' from Mail?

I believe sending messages with this header was covered in the original hint that I linked to.

For those of us who use Entourage, this is how I set up a rule (Tools > Rules > New) for incoming messages with the return receipt header. Open image link below to see my settings:
http://img46.imageshack.us/img46/9954/picture10tw.jpg