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Using image links 'calling back home' isn't reliable, because email clients have options to prevent such images from being shown automatically, especially if those emails might be considered spam.

Considering Outlook and Gmail block them by default, it's extremely unreliable

In this case though, it shouldn't hard confirmations, a possibly increase them a little. Unless people choose not to confim because they get a "images have been blocked" message.

It will also give better data - you can see of the people who opened the email and displayed images, what percent actually clicked the link.

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