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In my experience, it's mostly the situations where people give their emails in person that are a problem: Receipts from in-store purchases (and in-store credit card signups), hotel reservations and rewards programs, EMR signups, lawyers offices, banks, realtors, etc.

Websites are pretty good at verifying email addresses these days. The real world, not so much. The super funny part is when you try to ask the bank/doctor/etc. to stop sending someone else's personal info to your email address, and they tell you they can't make that change since you aren't the account owner.