I am totally out of the loop when it comes to these things. My client always opens in plain text or html render with JS and external content disabled.
I believe this is true for most clients. On the other hand security scanners, browsers engines and other Middleware stuff can trigger such a counter without any user interaction if I am not mistaken.
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Email pixel tracking is an industry standard these days. Every time the email loads the pixel, it counts +1.
Some platforms like Gmail partially obfuscate it.
I am totally out of the loop when it comes to these things. My client always opens in plain text or html render with JS and external content disabled. I believe this is true for most clients. On the other hand security scanners, browsers engines and other Middleware stuff can trigger such a counter without any user interaction if I am not mistaken.
The pixel is just an image, so unless you disable email images loading by default, the server will still count you.
Pre-caching will sometimes mess with the counters though, making the counts lower than the actual.
I understand. The last 3 email clients I used do not load images by default (that what's included in external sources [previous comment]).