Publish a BIMI record and obtain a VMC or CMC certificate for logo display

Steps

1. Ensure your domain has a DMARC policy of at least p=quarantine or p=reject and has maintained that enforcement level continuously for 30 or more days, as most mailbox providers enforce this prerequisite before displaying your logo.
2. Prepare your brand logo as an SVG Tiny PS file: the file must use the SVG Tiny 1.2 Portable/Secure profile, be square (1:1 aspect ratio), under 32 KB, and pass validation tools provided by the BIMI Group.
3. Host the validated SVG at a stable HTTPS URL (for example https://yourdomain.com/bimi/logo.svg); the file must be publicly accessible with no authentication gate.
4. Obtain a Verified Mark Certificate (VMC) from a CA such as DigiCert or Entrust if you need Gmail or Apple Mail support, or a Common Mark Certificate (CMC) if your logo is not trademark-registered and you only need providers that accept CMCs (Gmail accepts CMCs as of September 2024; Apple Mail still requires VMC). Host the issued PEM file at a stable HTTPS URL.
5. Publish a BIMI TXT record at default._bimi.yourdomain.com with the format: v=BIMI1; l=https://yourdomain.com/bimi/logo.svg; a=https://yourdomain.com/bimi/cert.pem
6. Validate the full setup with the BIMI Group's Inspector tool; allow up to 72 hours for mailbox providers to fetch and cache the new record before logo display appears.