A new standard called RRVS [Require-Recipient-Valid-Since] allows Facebook to timestamp a password recovery messages to show Yahoo the last time the email address was legitimately used.
Built using the Simple Mail Transfer Protocol [SMTP], could allow webmail providers to reclaim millions of addresses that haven’t been used for years.
The system will only work at the providers’ end if they sign up, but it may be too late for users that have already seen old email addresses grabbed by other people.
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