4 ms·

The same tracking functionality can be attached to logos in the email without raising any suspicion.

• OJFord 6y ago
  Who blocks (attempts to block) tracking pixels but allows other remote images? How many clients even offer that?
  • mcv 6y ago
    I think I can allow images from the same domain as the email, while blocking other images. If not, I think that could be a useful feature to have.
  • kevincox 6y ago
    Thunderbird lets you select by image domain, which can be telling. However it is still guesswork.
• iamacyborg 6y ago
  It can be attached to any remotely accessed image. IIRC, Facebook were using audio tags at one point for email tracking.