Why BIMI changes the game for your emails
Displaying a logo in the inbox is not a cosmetic feature. Deliverability studies show that a verified logo increases open rates and reduces spam reports, because recipients visually recognize the sender before they even read the subject line. Gmail introduced BIMI support in 2021 for trademarked brands (VMC), then extended that support to Common Mark Certificates (CMC) in early 2025 — allowing organizations without an official trademark to benefit from the same display. In 2026, four major platforms support BIMI: Gmail, Yahoo Mail, Apple Mail and Fastmail. The signal is clear: BIMI is becoming a standard for professional email, just as HTTPS became a standard for the web.
What BIMI delivers in practice
- Immediate visual recognition — your logo appears next to the sender name before the recipient even opens the message.
- Improved open rates — a visually identifiable sender reduces hesitation and spam reports.
- Reinforced anti-spoofing protection — BIMI is only accessible to domains with DMARC at
p=quarantineorp=reject: a natural filter against phishing. - Brand recall — repeated logo exposure in the inbox anchors the brand, even on unopened emails.
- Platform trust signal — Gmail adds a verified blue checkmark indicator to messages carrying a VMC, visible to all recipients.
The prerequisites: DMARC first, BIMI second
BIMI is the visual layer that sits on top of solid email authentication. Without the foundations in place, it is impossible to publish a valid BIMI record. The non-negotiable condition is a DMARC record with p=quarantine or p=reject — p=none is not sufficient. SPF and DKIM must also be configured and aligned with your sending domain. In practice: if your _dmarc.your-domain.com record shows p=none, start by hardening your DMARC configuration before tackling BIMI. The article on SPF, DKIM and DMARC covers this step in detail.
Setting up BIMI step by step
Verify that DMARC is in enforcement mode
Check the TXT record on _dmarc.your-domain.com: the policy must be p=quarantine or p=reject. A tool like MXToolbox DMARC Lookup or BIMI Inspector confirms this in seconds.
Prepare your logo in SVG Tiny P/S format
BIMI requires a strict SVG format: SVG Tiny 1.2 Portable/Secure, with no scripts or external elements, square background with recommended inner margin. Your logo must be centered on a solid background. Tools like the BIMI Group SVG converter validate and fix the file. Host it over HTTPS on your domain.
Choose between VMC and CMC based on your situation
The VMC (Verified Mark Certificate) is required for Gmail's verified blue checkmark — it requires a trademark registered with an official office (USPTO, EUIPO…) and is issued by authorities like DigiCert or Entrust. The CMC (Common Mark Certificate), introduced by Google in early 2025, does not require a trademark: your logo simply needs to have been used publicly for at least 12 months. If you have no registered trademark, start with CMC.
Publish the BIMI DNS record
Create a TXT record on default._bimi.your-domain.com. Basic format (without certificate): v=BIMI1; l=https://your-domain.com/bimi-logo.svg. With VMC or CMC: v=BIMI1; l=https://your-domain.com/bimi-logo.svg; a=https://your-domain.com/bimi-cert.pem. DNS propagation can take up to 48 hours.
Verify with BIMI Inspector or MXToolbox
Send a test email to a Gmail or Yahoo account and observe whether the logo appears. Use BIMI Inspector to validate the DNS record, the SVG and the certificate. The most common errors: non-compliant SVG, logo URL not reachable over HTTPS, or DMARC still at p=none.
Start with CMC if you have no registered trademark
Since early 2025, Google accepts Common Mark Certificates for logo display in Gmail, with no official trademark required. The only condition: your logo must have been used publicly and continuously for at least 12 months. For most agencies and SMEs, that is sufficient. CMC costs less than a VMC and is obtained faster. You can switch to a VMC if you register your trademark later — only the a= field in the DNS record changes.
BIMI: a step that strengthens your entire email sending
Implementing BIMI requires having impeccable email authentication in place. That is precisely its secondary value: the process forces you to verify and harden SPF, DKIM and DMARC before going further. Once BIMI is published, your sending domain is better protected against phishing, your emails are better accepted by recipient servers, and your logo appears in the inboxes of major platforms. For agencies and professionals who send commercial or transactional emails, this is a concrete differentiator — visible at every inbox open.
