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Re:Microsoft adding support for custom '+' email addresses i... by Xylakant on Tuesday July 14, 2020 @07:19AM (#23830592)
The parent post to the one you're responding explicitly calls out that they cannot unsubscribe from lists when they've subscribed with a +-address:

> I have several services I will never be able to unsubscribe from because of the latter—and yes, I tried manually URI encoding it

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