Whenever I print an email from Thunderbird, I get 1-1/2 pages of unwanted tracking/header data at the top. By using Print Preview, I can at least tell it to skip the first page, but it's still far from optimal. I've found that if I save an email and then print from the saved file, it prints more normally, although it still appends all of the tracking data to the end. This is also a tedious, undesirable workaround, though, that adds several steps. I'm running Thunderbird 52.9.1 (32 bit) in Windows 10.