BIMI

BIMI (Brand Indicators for Message Identification) lets mailbox providers display your logo next to authenticated mail. The record is a TXT at <selector>._bimi.<domain>; the default selector is default.

BIMI only works on top of strict DMARC: p=quarantine (applied at 100 %) or p=reject, and a published sp= must not be none. The logo must be an SVG in the Tiny Portable/Secure profile, at most 32 KB, served over HTTPS; Gmail and Apple Mail additionally require a Verified or Common Mark Certificate (VMC/CMC) referenced via a=. The optional avp= tag (avatar preference) asks providers to prefer the sender's personal avatar over the brand logo. Note that BIMI is an Internet-Draft, not an RFC – details may still change.

Domain

Selector

Logo URL (l=)

HTTPS URL of the SVG logo (SVG Tiny Portable/Secure).

Mark certificate (a=, optional)

HTTPS URL of the VMC/CMC evidence document (PEM).

Avatar preference (avp=, optional)

With avp=personal, mailbox providers should show the sender's personal avatar; the logo serves as fallback.

Publish a declination record (v=BIMI1; l=; a=;) – explicitly opt out of BIMI

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