BIMI (Brand Indicators for Message Identification) is an email authentication standard that allows brands to display their verified logo next to their emails in supporting email clients. It works by adding a special DNS TXT record that references your brand's SVG logo and an optional Verified Mark Certificate (VMC). When an email passes DMARC authentication, the receiving email client looks up the BIMI record and displays your logo, building trust and brand recognition with recipients.

Your SVG logo must meet these specifications: SVG Tiny 1.2 profile (a simplified subset of SVG), square aspect ratio (1:1), solid background (no transparency for best cross-client compatibility), centered logo within the viewport, HTTPS hosting on a publicly accessible URL, and the file should be optimized to a reasonable size (under 32KB recommended). Avoid complex animations, external resources, or scripts within the SVG.

A Verified Mark Certificate (VMC) is a digital certificate issued by trusted Certificate Authorities (like DigiCert or Entrust) that verifies your brand's trademarked logo. It proves that you legally own the logo you're using for BIMI. While technically optional in the BIMI specification, most major email providers (including Gmail and Yahoo) require a VMC to display your logo. The VMC is issued in .pem format and must be hosted on an HTTPS URL referenced in your BIMI record via the a= parameter.

BIMI is supported by several major email platforms: Gmail (with VMC), Yahoo Mail (with VMC), Apple Mail (iOS 16+, macOS Ventura+), Fastmail, Zone, and Cloudmark-protected mailboxes. Support continues to grow as more email providers adopt the BIMI standard. Note that Gmail and Yahoo require a valid VMC, while Apple Mail can display BIMI logos without a VMC in some cases.

Yes, absolutely. BIMI requires that your domain has a valid DMARC policy in place with the policy set to p=quarantine or p=reject. A DMARC policy of p=none is not sufficient for BIMI. This ensures that only authenticated emails from your domain can display your brand logo, protecting your brand from spoofing and phishing attempts. Make sure your SPF and DKIM are also properly configured.

You can test your BIMI setup by: 1) Using a BIMI inspector tool (like the BIMI Group's official validator or MXToolbox BIMI check), 2) Running a DNS TXT lookup on default._bimi.yourdomain.com, 3) Sending a test email to a Gmail or Yahoo account (with VMC), 4) Checking email headers for BIMI-related authentication results. Remember that DNS propagation can take up to 48 hours, so allow time after making changes.

The BIMI DNS TXT record follows this format:
Hostname: default._bimi.yourdomain.com (or {selector}._bimi.yourdomain.com)
Record Type: TXT
Value: v=BIMI1; l=https://yourdomain.com/logo.svg; a=https://yourdomain.com/vmc.pem;

The v= tag specifies the BIMI version, l= specifies the logo URL, and a= specifies the VMC authority URL. Each parameter is separated by a semicolon and space.

No. The BIMI specification only supports SVG Tiny 1.2 format for brand logos. PNG, JPEG, WebP, or other raster formats are not accepted. This is because SVG is scalable, lightweight, and can be rendered consistently across different email clients and screen sizes. Ensure your logo is properly converted to SVG Tiny 1.2 format — standard SVG files may need to be simplified to meet the Tiny 1.2 profile requirements.

After adding your BIMI DNS record, it typically takes 24 to 48 hours for DNS changes to fully propagate globally. However, email providers may also cache BIMI records, so it could take additional time before your logo appears consistently. Once DNS propagation is complete, new emails sent from your domain should begin displaying your brand logo in supported email clients. Note that each email client may have its own caching policies.

Technically, the BIMI specification lists the VMC as optional. However, in practice, a VMC is required by the largest email providers including Gmail and Yahoo. Without a VMC, your logo will likely not display in these major inboxes. Some smaller providers or Apple Mail may show BIMI logos without a VMC, but for broad compatibility and maximum brand visibility, obtaining a VMC from an authorized Certificate Authority is strongly recommended.