Well, I don't think you can do anything such as hide links from email scanners or mask tracking pixels, as even if you do so and the platform somehow sends an email masking the tracking pixels or links from the scanners, then the scanners will evolve to still check emails (and click-through) the links. Also, if this proves possible, then mail scanners as a whole are useless. The major purpose of email scanners is to check the links and email content for spam or suspicious content. The fundamental idea behind a mail scanner is to mimic human behavior seamlessly. Any detectable deviation indicates a flaw.