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usually it is someone who has their email john.r.smith or similar and forgets they need the r

There are other stories of people forgetting which company it was with (gmail vs yahoo) and even of google accidentally giving out emails with a period and then silently removing periods.

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The Gmail domain will deliver email to an email address regardless of periods in the username. My email address is first name period middle initial period last name. I can a period between any letter, all letters or none and I can still receive it.

Yeah, the story goes that very early on it let two people register joe.blow and joeblow.

PayPal let someone else add my Gmail address to their account, so I have to use a +paypal in my own account email.

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