Open the email
click on "Actions"
click on "Delivery Information."
pick out the internet-style mail header information from the window that appears when you select Delivery Information.
Lotus Notes v.4.x
Look for the first line that begins with "Received". There should be a blank line just above it. Then, scroll down to the next blank line. The stuff in between the two blank lines are the headers you need.
Lotus Notes v.5.x
Look for the seperator line that reads
-------- Additional Header ------
Select everyhing from there down to the next seperator line, usually
-------- Routing Information -----
The stuff in between the two seperator lines are the headers you need.
Lotus Notes v.5.x (easier method)
Open your inbox
Highlight the message that you wish to get header information for.
Choose File -> Export...
Type in a filename, leave the type as "Structured Text" and click Export
From the Dialog Box that comes up, choose "Selected Documents" and click OK
Now you can open that message you saved in Wordpad and Cut&Paste it into the the form website parsing box.