Custom tracking pixel

Hi, i am trying to add my own custom tracking image pixel to my campaigns for passing some data back to my own custom app, but i am finding that the pixel is being stripped out completely from the email.

Here is my pixel:
<img width="1" height="1" src="https://APPDOMAIN.com/import.php?EMAIL=&FNAME=[FNAME]" alt="" />

Is there any reason why it might be being stripped out from the email?
 
I added it just to a regular campaign for testing, if it worked i was intending to add it in the global footer from the backend.
1677050370822.png
 
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