BIMI: Driving Email Engagement Through Verified Brand Logos

BIMI: Display Your Brand Logo in Email Inboxes

BIMI (Brand Indicators for Message Identification) acts as the final layer in the email authentication stack, transforming invisible security protocols into visible brand assets. Research from the BIMI Working Group shows that these verified logos can increase email open rates by 10–39%.

Why This Matters

In technical email infrastructure, SPF and DKIM provide security but offer no user-facing trust signals. BIMI bridges this gap by requiring DMARC enforcement (p=quarantine or p=reject) before a brand logo can be displayed, effectively incentivizing domain owners to adopt higher security standards in exchange for marketing visibility. For large-scale organizations, the annual cost of $1,299+ for a VMC certificate is offset by improved deliverability and the reduction of phishing risks through visual verification.

Key Insights

• BIMI support extends to over 1.8 billion mailboxes including Gmail, Apple Mail, and Yahoo as of 2024.
• Gmail and Apple Mail require a Verified Mark Certificate (VMC) for logo display, currently issued only by DigiCert and Entrust.
• Logo files must strictly adhere to the SVG Tiny PS (Portable/Secure) 1.2 specification, which disables scripting and external references.
• DMARC enforcement is a hard prerequisite; policies set to p=none will result in the BIMI record being ignored by receivers.
• VMC issuance requires a registered trademark in an accepted jurisdiction such as USPTO, EUIPO, or WIPO Madrid.

Working Examples

Standard BIMI DNS TXT record including version, logo URL, and authority (VMC) URL.

default._bimi.example.com TXT "v=BIMI1; l=https://example.com/brand/logo.svg; a=https://example.com/brand/vmc.pem"

Minimal valid SVG Tiny PS template with required version and baseProfile attributes.

<svg version="1.2" baseProfile="tiny-ps" xmlns="http://www.w3.org/2000/svg">
  <title>Example Corp Logo</title>
  <circle cx="50" cy="50" r="40" fill="blue" />
</svg>

Practical Applications

• High-volume senders: Deploying BIMI to increase brand recall and open rates by up to 39% for marketing campaigns.
• Phishing protection: Financial and e-commerce institutions using VMC to provide a cryptographic visual trust indicator in Gmail and Apple Mail.
• Pitfall: Using standard SVGs with embedded raster images or scripts, which causes silent failures in logo rendering.
• Pitfall: Attempting BIMI deployment on a domain with DMARC p=none, which prevents all BIMI-supporting providers from displaying the logo.

References:

• https://dev.to/toolbox_starnomina/bimi-display-your-brand-logo-in-email-inboxes-1hjo