A lot of these replies are missing the point. SPF/dkim/dmarc verifys the sender is authorized by the domain owner to send an email as that domain. The blue check mark that Twitter uses or used to use serves a different function entirely. The blue checkmark verifys that the account is owned by a legitimate and notable person or organization. Applying the blue checkmark to email would result in a checkmark for PayPal.com but not one for paypals.com, even though the person who owns paypals.com sent the email they are not notable enough to receive the blue checkmark.
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