Lotus Notes Version 6.x You might be able to get header information (of an "open" email) by clicking on
This will show the entire contents of the message, with of course, the headers at the top of the message.
Also, in Lotus Notes version 4x, 5x, you can click on "Edit/Properties" -
Click on the 2nd tab, and you'll find quite a number of fields.
Lotus Notes breaks up the various header entries into various "received" fields- which are individually selectable, copy and pasteable.
A little cumbersome, but a method that I've had to use for troubleshooting in the past.
Additional info -- The "Received" fields are where it holds the SMTP headers. It is cumbersome, but you could also write a quick app to pull those fields, or, the OpenNTF.org modified mail template has a little button in it that will display the header info for you. All it does is grab the Received field info and display it.