What is BIMI?

BIMI (Brand Indicators for Message Identification), is a specification allowing for the display of brand logos next to authenticated e-mails.

There are two parts to BIMI: a method for domain owners to publish the location of their indicators, and a means for Mail servers to verify the authenticity of the indicator.

To implement BIMI, a valid DMARC DNS record with a Quarantine or Reject policy, an exact square logo for the mark in SVG Tiny P/S format, and a DNS TXT record for the domain that specifies the URI location of the SVG file are required. The only supported transport for the SVG URI is HTTPS.

See also:
Wikipedia: BIMI