Hello @_Mystic_Chorale ,
If they forward the email through their email client, or if they have any settings in their email client that would auto-unsubscribe them after a particular trigger, then those are the most common culprits.
Since unsubscribe links are coded to the original recipient, forwarding it to someone that clicks that unsubscribe link (and not actually check the email address before confirming on the next page), would result in the original recipient being unsubscribed.
If a recipient's email client has any settings to trigger auto-unsubscribes, such as deleting emails from the same source X amount of times without reading/opening them, it can result in unsubscriptions that we have to honor for legal and compliance reasons.
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