BIMI, or Brand Indicators for Message Identification, is an email specification that allows organisations to display their brand logo alongside authenticated emails in supported inboxes. It builds on existing email authentication standards by requiring domains to have properly configured SPF, DKIM, and a DMARC policy set to enforcement. When these conditions are met, participating email providers can display a verified logo next to incoming messages, enhancing visual trust and brand recognition.
Unlike traditional email authentication, BIMI focuses on brand presentation rather than message validation. It provides a consistent visual identifier that helps recipients quickly recognise legitimate communications and distinguish them from fraudulent messages. This improves user confidence and reduces the likelihood of phishing success.
BIMI requires the publication of a DNS TXT record that points to a hosted SVG logo file. In many cases, organisations must also obtain a Verified Mark Certificate to confirm ownership of the logo. Together, these elements create a standardised way to associate brand identity with authenticated email.
Advanced
BIMI implementation requires strict alignment with DMARC policies set to quarantine or reject. Without enforcement, BIMI will not be activated by most mailbox providers. The logo must be in SVG Tiny PS format, meet specific technical requirements, and be hosted over HTTPS. The DNS BIMI record references this logo and optionally includes a pointer to the Verified Mark Certificate.
The Verified Mark Certificate is issued by approved certificate authorities and acts as proof of trademark ownership. This adds a layer of trust and prevents unauthorised use of brand assets. Not all email providers require a VMC, but major platforms such as Gmail enforce this requirement for logo display.
Adoption of BIMI varies across providers, and rendering behaviour may differ. Businesses must ensure full alignment across SPF, DKIM, and DMARC, as any authentication failure can prevent logo display. Monitoring DMARC reports and BIMI validation tools is essential for maintaining consistent visibility.
Relevance
- Enhances brand visibility directly within email inboxes
- Increases trust and recognition for legitimate communications
- Supports phishing prevention through visual verification
- Reinforces the value of strong email authentication practices
Applications
- Displaying verified brand logos in customer communications
- Strengthening marketing and transactional email identity
- Supporting brand consistency across digital touchpoints
- Improving user engagement and open rates
Metrics
- Email open rates influenced by brand recognition
- DMARC compliance and enforcement rates
- BIMI logo display success across mailbox providers
- Customer trust and engagement metrics
Issues
- Missing or weak DMARC policy preventing BIMI activation
- Incorrect SVG format or hosting issues blocking logo display
- Lack of Verified Mark Certificate limiting compatibility
- Inconsistent authentication causing intermittent visibility
Example
A financial services company implements SPF, DKIM, and enforces a DMARC reject policy. It publishes a BIMI record pointing to its verified logo and obtains a Verified Mark Certificate. As a result, its logo appears in supported inboxes, increasing customer trust and improving engagement with transactional emails.