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BIMI (Brand Indicators for Message Identification) is an email specification that lets organisations display their logo in the email client's inbox beside messages that pass DMARC authentication. It works by publishing a DNS TXT record at default._bimi.{yourdomain} that points to your brand logo in SVG format. When a recipient's email client supports BIMI and your domain passes DMARC, your logo appears next to your emails — increasing brand recognition and trust.

A VMC (Verified Mark Certificate) is a digital certificate issued by an approved Certificate Authority (currently DigiCert or Entrust) that cryptographically verifies your brand's right to use a specific logo. It is required by Gmail and some other major providers before they will display your BIMI logo. Other providers, such as Yahoo Mail and Fastmail, support BIMI without a VMC. The a= field in your BIMI record should point to your VMC file (a PEM-encoded certificate). Without a VMC, your logo may still display in clients that do not require it, but you won't achieve full coverage.

BIMI support is growing. As of 2025, the following providers support BIMI logo display: Gmail (requires VMC), Yahoo Mail, Apple Mail (iOS 16+ / macOS Ventura+), Fastmail, La Poste, and Proofpoint-secured inboxes. Microsoft Outlook and Office 365 do not yet support BIMI. For BIMI to activate at any provider, your domain must have a DMARC policy of p=quarantine or p=reject — a p=none policy is not sufficient.

To display your logo via BIMI, follow these steps: 1) Ensure your domain has a valid DMARC record with a policy of quarantine or reject. 2) Convert your logo to a Tiny PS SVG (a strict SVG profile required for BIMI — standard SVGs are usually not accepted). 3) Host the SVG file at a publicly accessible HTTPS URL. 4) Publish a DNS TXT record at default._bimi.yourdomain.com with the value v=BIMI1; l=https://yoursite.com/logo.svg;. 5) Optionally, obtain a VMC certificate and add the a= field pointing to your certificate URL for providers that require it. Propagation typically takes up to 48 hours.