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We're in the process of verifying all the identities that people use, so that we can turn on stricter controls over sending (not allow email through our servers if the connection is authenticated as user A but the email claims to be from user B).
Eventually if you have a wildcard sending identity at one of our domains, your send will be rejected unless you use one of the specific aliases that you actually own within that domain - you won't be able to send as an arbitrary address in that domain which you haven't claimed.
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