What is BIMI and how does it work?

BIMI (Brand Indicators for Message Identification) is an email standard that allows organizations to display their verified brand logo next to their sender name in supporting email clients. It works by publishing a BIMI DNS record that points to an SVG logo file, and requires DMARC enforcement (p=quarantine or p=reject) as a prerequisite.

What are the requirements to implement BIMI?

BIMI requires: DMARC policy set to quarantine or reject with full alignment, a BIMI DNS TXT record published at default._bimi.yourdomain.com, a logo file in SVG Tiny 1.2 PS format, and for Gmail and Apple Mail display, a Verified Mark Certificate (VMC) from DigiCert or Entrust tied to a trademarked logo.

Which email providers support BIMI?

Gmail, Yahoo Mail, Apple Mail, and Fastmail currently support BIMI logo display. Microsoft has indicated Outlook support is forthcoming, which will make BIMI coverage essentially universal across major email clients.

Do I need a Verified Mark Certificate (VMC) for BIMI?

A VMC is required by Gmail and Apple Mail for full BIMI logo display. It requires a trademarked logo and is issued by DigiCert or Entrust. Yahoo Mail and some other providers will display BIMI logos without a VMC, but for maximum coverage including Gmail, a VMC is necessary.

How does BIMI improve email security?

BIMI improves email security in two ways: it requires DMARC enforcement as a prerequisite, which prevents domain spoofing, and it provides a visual trust indicator that helps recipients distinguish legitimate brand emails from phishing attempts — since attackers cannot display a verified brand logo without the proper authentication and VMC.

BIMI — Your Brand Logo in the Inbox

Your emails are authenticated. SPF passes. DKIM aligns. DMARC is enforced.

But when your message lands in someone’s inbox, what do they see next to your name?

A generic initial. A blank avatar. Nothing that says this is us.

That’s the gap BIMI closes.

What BIMI Actually Does

Brand Indicators for Message Identification (BIMI) lets you display your verified brand logo directly in the inbox — right next to the sender name, where recipients make split-second decisions about what to open and what to ignore.

It’s not just cosmetic. It’s a trust signal backed by authentication infrastructure.

Why It Matters Now

Here’s what BIMI delivers when implemented correctly:

Instant brand recognition — Your logo appears before the subject line is even read
Higher open rates — Recipients engage more with messages from visually verified senders
Anti-phishing protection — Spoofed emails can’t display your verified logo
Competitive differentiation — Most senders still show a blank avatar
Authentication discipline — BIMI requires DMARC enforcement, which strengthens your entire email security posture

The Requirements

BIMI isn’t a standalone feature you flip on. It sits on top of a fully enforced authentication stack:

DMARC at p=quarantine or p=reject — No exceptions
A BIMI DNS record — Points to your logo SVG file
SVG Tiny 1.2 PS format — Specific format required for the logo file
Verified Mark Certificate (VMC) — Required by Gmail and Apple Mail for full logo display

The VMC is the biggest barrier for most organizations — it requires a trademarked logo and a certificate from DigiCert or Entrust. But the investment pays dividends across every email you send.

Who Supports It

Gmail, Yahoo Mail, Apple Mail, and Fastmail all support BIMI logo display. That covers the majority of consumer and business inboxes worldwide.

Microsoft has indicated support is coming for Outlook — which will make BIMI essentially universal.

The Bottom Line

Email authentication gets your messages delivered. BIMI makes them recognized.

In a crowded inbox, the difference between opened and ignored often comes down to one thing: does the recipient instantly know who you are?

Your brand logo, verified and displayed at the moment of decision — that’s BIMI.

If your DMARC is already enforced, you’re one step away from turning every email into a branded touchpoint.

#BIMI #EmailAuthentication #EmailDeliverability #BrandSecurity #DMARC #EmailMarketing #CyberSecurity #BrandIdentity

Author

Harry Shuford

Harry Shuford is an IT specialist and technical writer with a focus on email delivery, deliverability, and the systems that power modern digital communication. With a strong understanding of the technical factors that influence email performance, he writes blog content that helps businesses better understand inbox placement, infrastructure, and best practices for reliable email delivery.