marketing:email:bimi

About

With BIMI ¹⁾, a logo file should be displayed in the receiver inbox.

Even if a trademark certificate is not requested by BIMI, most email providers require one, making it difficult for small companies to implement it.

When all requirements pass, the email provider will look up a TXT record where the content starts with v=BIMI1. In this record, it will find:

With a TTL equivalent of 1 hour, the value of the TXT record could be:

v=BIMI1;l=https://example.com/brand-logo.svg

A Verified Mark Certificate (VMC) is a proof that the logo has been validated.

You can add a verified mark certificate if you have requested one with the a attribute

v=BIMI1;l=l=https://example.com/brand-logo.svg;a=l=https://example.com/vmc-certificate.pem

The full record example value if the BIMI group reference is:

default._bimi.example.com in txt 
"v=BIMI1; l=https://www.example.com/path/to/logo/example.svg; a=https://www.example.com/path/to/vmc/VMC.pem;"

A BIMI record has three attributes:

The BIMI record is retrieved from the domain identified within the DKIM domain (ied=) value.

A single global BIMI Record at the apex domain (organization domain) will cascade down to other subdomains

BIMI supports selectors allowing the same domain to publish multiple but separate records.

It could be used to segment different logos.

The base selector is default.

The DNS name should look similar to this default._bimi.example.com

BIMI requires:

messages to pass the DMARC check (ie to be authenticated)
the DMARC values of:
- reject for the p policy attribute
- 100 for the pct percentage attribute

The logo URL (ie referenced by the l=):

should be in HTTPS
can resolve to any domain and directory path. It does not need to match the domain where the BIMI logo is published.

²⁾

The BIMI standard does not require your logo to be a registered trademark to get a VMC ³⁾

But most providers do.

The SVG file requirements are:

SVG Tiny: ⁴⁾:
- Format: SVG Tiny Portable/Secure (SVG Tiny PS)
- baseProfile attribute: tiny-ps
- version attribute: 1.2
<title> element: Should reflect your organization name. There are no strict requirements for the title value.
Don’t include:
- External links or references, other than to the specified XML namespaces
- Scripts, animations, or other interactive elements
- x= or y= attributes in the <svg> root element

Google guidelines for compatibility

Centered in a square.
On a solid color background. Transparent backgrounds might not display as expected.
96 x 96 pixels or larger. (Gmail doesn't support SVG files with smaller dimensions ⁵⁾)
A small file size (<32 KB)
The <desc> (description) element, for accessibility.