analytics - Proper way to track emails -

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i use thunderbird send out email campaigns. since not have resources pay email application tracking built in, wondering if there recommended ways track opens in emails code myself?

a tracking pixel used this. it's image 1px 1px include in email. through server log see how many times image downloaded. issue solution many people have emails set not download images automatically , have accept them first (which not does) may not 100% accurate.


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