Please read my first post, I stated clearly that I am looking @ tracking
Which still could mean lots of things depending on how you would define
"page" and at what time you are looking at it. The general option for it
could be something you call "page" or the per message Options... screen. In
your case it was the tracking tab on the sent item. That's why including
steps to reproduce are so important to post as then it is clear what you are
doing and what you are looking at.
No one said any thing about outside my organization
Which is why I had to make another assumption. You're stressing my point
here.
I got the rest of your message, which is why I asked how the icon of your
received read receipt looked like. Is this with the special tracking icon or
not?
Do you have any mail scanning software installed which can modify the
message header information? They could break it as well for you.
If you have access to OWA, you could try to use that and see how the
information is being received (with tracking icon or not). This way you
leave Outlook out of the equation which allows you determine where the
corruption is taking place.