1. The Evolution of Brand Indicators for Message Identification (BIMI)
Brand Indicators for Message Identification (BIMI) is an email ecosystem specification that enables organizations to display their official trademarked logo directly within the inbox UI of major email clients, including Gmail, Apple Mail on iOS/macOS, Yahoo Mail, and Fastmail.
Unlike proprietary avatar solutions (such as Gravatar or Google Account profile photos), BIMI is tied directly to cryptographic email authentication standards (SPF, DKIM, and DMARC). For a mailbox provider to render a BIMI logo, the message must achieve 100% DMARC identifier alignment and originate from a domain enforcing strict anti-spoofing policies (p=quarantine or p=reject).
2. The SVG Tiny Portable/Secure (P/S) Formatting Specification
Standard SVG files containing scripts, external fonts, or bitmap imagery pose security and rendering risks. Mailbox providers strictly enforce the SVG Tiny P/S profile:
viewBox="0 0 512 512" attribute.3. Frequently Asked Questions (BIMI & VMC Engineering FAQ)
What is BIMI and why is it important?
BIMI (Brand Indicators for Message Identification) is an email standard that allows authenticated senders with DMARC enforcement to display their official trademarked logo next to inbound messages in major mailboxes (Gmail, Apple Mail, Yahoo Mail). It drives higher open rates, reinforces brand recognition, and protects customers against visual phishing.
Do I need a Verified Mark Certificate (VMC) for BIMI?
For Gmail and Apple Mail, a VMC issued by an authorized CA (such as DigiCert or Entrust) is mandatory. Yahoo Mail supports self-asserted BIMI without a VMC for senders with exceptional domain reputation, but acquiring a VMC is strongly recommended for universal display.
What are the exact SVG requirements for a BIMI logo?
The logo must conform to the SVG Tiny Portable/Secure (SVG Tiny P/S) profile. Requirements include: 1:1 square aspect ratio, centered graphics, viewBox attribute present, no embedded raster images (PNG/JPEG), no external font or script references, and file size under 32 KB.
Why is DMARC p=none not supported for BIMI?
BIMI is a reward mechanism for organizations that protect their domain from spoofing. Because p=none provides zero anti-spoofing protection, mailbox providers mandate active enforcement (p=quarantine with pct=100 or p=reject) before rendering brand logos.
Where is the BIMI DNS record published?
A BIMI record must be published as a DNS TXT record at default._bimi.yourdomain.com (or using a custom selector e.g. promo._bimi.yourdomain.com).
How long does it take for Gmail to display my BIMI logo after DNS deployment?
Once DNS propagates and VMC certificates are validated, mailbox providers usually take between 48 hours and 2 weeks to begin rendering logos in inboxes, depending on sending volume and sender reputation history.
Which email clients currently support BIMI logo display?
As of 2025, Gmail (web and Android), Apple Mail (iOS 16+ and macOS Ventura+), Yahoo Mail, AOL Mail, Fastmail, and La Poste support BIMI logo rendering. Outlook desktop does not yet support BIMI natively, though Microsoft has announced plans for adoption.
Can I use a BIMI logo without a trademark registration?
VMC certificates from DigiCert or Entrust require active trademark registration in the sending country. Without trademark registration, you cannot obtain a VMC and cannot display BIMI logos in Gmail or Apple Mail. Yahoo Mail allows self-asserted BIMI (no VMC) for senders with established reputation, but coverage is limited.
How much does a Verified Mark Certificate (VMC) cost?
VMC certificates from DigiCert or Entrust typically cost between $1,000 and $1,500 USD per year. Annual renewal is required. The certificate must link to a valid HTTPS-accessible SVG Tiny P/S logo file at the URL specified in your BIMI DNS record.
What DMARC policy do I need to be BIMI eligible?
Your DMARC record must be set to at least p=quarantine with pct=100, or p=reject. Partial enforcement (pct less than 100) or monitoring-only (p=none) policies do not qualify. Use the DMARC Generator to build the correct record, then verify it with the DMARC Checker tool.
Can I use a BIMI selector other than 'default'?
Yes. BIMI supports custom selectors for multi-brand or campaign-specific logo display. Publish TXT records at [selector]._bimi.yourdomain.com (e.g. brand2._bimi.yourdomain.com). The mailbox provider chooses which selector to display based on the BIMI-Selector: header in the email, if supported.
What is the difference between BIMI and email avatars from Google Workspace?
Google Workspace profile photos appear based on the sender's Google account avatar and are not verified or branded. BIMI logos are tied to cryptographic DMARC authentication and require a VMC. BIMI logos display the same brand mark consistently across all recipients and email clients, regardless of Google account configuration.
How do I test my BIMI record before it goes live?
Use IncogSay's BIMI Checker to validate your DNS TXT record syntax, confirm the SVG URL is reachable over HTTPS, and verify VMC certificate chain validity. You can also send a test message to a Gmail account and check if the logo appears in the sender avatar area.
Does BIMI improve email deliverability or open rates?
BIMI itself does not directly affect spam filtering or deliverability. However, BIMI eligibility requires DMARC p=reject or p=quarantine, which is the primary anti-spoofing signal that improves deliverability. Studies by Mailchimp and Entrust indicate BIMI-enabled senders see 10–30% higher open rates due to the trust signal of displaying a verified brand logo in the inbox.