This is known as BIMI… Brand Indicators for Message Identification. You can read more about it at:
Valimail -
How to add your email logo or brand mark to your emails -...
Learn everything you need to know to implement BIMI and add your email logo (or brand mark) to your emails in the inbox.Most of the requirements are not too hard to meet (SPF/DKIM/DMARC setup) but the VMC/CMC is going to be the tough part. Those certs are not cheap… like $1000 per year for the privilege of having your logo show up.
You would also have to get the site approved/verified by the cert provider who will have their own requirements in terms of if they require a business license, trademark proof, etc.
Basically if you try to do this, you’ll jump through a TON of hoops and pay a bunch of money for the cert itself that makes this possible. For 99% of sites, this is too much effort for the small amount of return.