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What is BIMI
BIMI is an Internet-Draft, not an RFC. A domain publishes a TXT assertion record under _bimi so a mail client can show a brand indicator next to authenticated mail.
brand._bimi.example.com IN TXT "v=BIMI1; l=https://image.example.com/bimi/logo/"
The current draft is draft-brand-indicators-for-message-identification-14, dated 1 May 2026, expires 2 November 2026. The default selector is queried at default._bimi.example.com. The TXT line above is the draft's example for selector brand. v=BIMI1; l=; a=; is a declination to publish.