What is BIMI?

BIMI, also known as Brand Indicators for Message Identification, is an email specification defined in RFC 9091 that allows mailbox providers to display a brand’s official logo next to authenticated messages. BIMI does not authenticate mail by itself. Instead it relies entirely on strong DMARC enforcement.

Think of BIMI as the ship’s flag that becomes visible only when the harbor has confirmed that the vessel is legitimate and follows all navigation rules.

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