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Yes, I know I've seen someone talk about this before, I think it's their link safety checking thing:

https://techcommunity.microsoft.com/t5/security-compliance-a...

It's odd that they're, essentially, fuzzing my app.

Agreed, it's curious! I wonder if they would still fuzz it if you changed the URL scheme to include the identifier as part of the URL path, rather than as a parameter? e.g., hxxp://example.com/unsubscribe/abcd1234

Please report back if you try it :-)

I could swear I've had that thing burn a one-time token for a password reset email before too, but it's hard to prove as a user. Doesn't feel great!

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