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BIMI

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Brand Indicators for Message Identification — displays a verified brand logo in supporting inboxes when DMARC is at enforcement and logo/VMC requirements are met.

Platform & Operations. Last reviewed July 2026.

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2serious gotchas

1regular gotcha

3tips

Definition

BIMI (Brand Indicators for Message Identification) lets supporting mailbox providers show your brand logo beside authenticated messages. You publish a BIMI DNS TXT record pointing to an SVG Tiny PS logo (often hosted on HTTPS). Many providers (notably Gmail) also require a Verified Mark Certificate (VMC) or related mark certificate from an approved CA. BIMI does not replace SPF/DKIM/DMARC — it builds on DMARC at enforcement (p=quarantine or p=reject).

When to use it

  • Brands that already (or nearly) enforce DMARC and want inbox logo recognition
  • Consumer-facing transactional and marketing mail where trust marks matter
  • Programs finishing bulk-sender authentication work and looking for a visible payoff

When not to use it

  • Domains still at p=none with unresolved spoofing or third-party senders
  • Expecting BIMI to fix spam-folder placement — it does not
  • Budgeting only for the logo file while ignoring VMC (~annual CA fees) and DMARC cleanup eng time

Tips

  • Validate SVG Tiny PS constraints before buying a VMC
  • Host the logo on a stable HTTPS endpoint (CloudFront + S3 is a common SES-adjacent pattern)
  • Track provider support matrix — not every client shows BIMI logos yet

Gotchas

Serious

  • Buying a VMC before DMARC enforcement is achievable — certificate idle time with no logo display
  • Broken HTTPS/CORS/content-type on the SVG URL → silent BIMI failure

Regular

  • Assuming Outlook will match Gmail’s BIMI behavior

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Pictures:James Murray in the Scriptorium (public domain); Card Division of the Library of Congress, 1900–1920 (public domain); Salle des catalogues, Bibliothèque Mazarine, Paris, Marie-Lan Nguyen (CC BY 2.0); Copyright card catalog drawer, Michael Holley Swtpc6800 (public domain); Type in sort case, Edinburgh City of Print (CC BY 2.0); Widener Library reading room, 1920 (public domain). Via Wikimedia Commons.