In an email you have received, if you want to see the routing information, full name of the sender, and which options (such as return receipt) the sender selected, then you can view the delivery information for that email.

For emails from Notes addresses

To view the delivery information, open the email, and click More > Delivery Information.





You'll get the delivery information in a dialog box, like this:



You can copy the information, but you cannot change it.

For emails from Internet addresses

If you received a message from an Internet address, you can see the HTML page source for the message (including the SMTP header information) by opening the message and clicking View > Show > Page Source.