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He didn't say they should have a special case. He just made a factual statement, "Sendy treats these email addresses as distinct, but they’re actually largely duplicates because of the Gmail period trick," and looked to implement recaptcha as a solution, which was poorly implemented. However, if you were going to do create one special case for a provider, gmail would be a good choice.

These addresses are distinct. They just point to the same mailbox. At best they can be called aliases. /p

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