Gmail has found a simple trick to distinguish legitimate emails from phishing

How do you know if an email you received from a company is legitimate? Use an official logo that responds to Google. This is the subject of a new authentication specification called BIMI (Brand Message Identification Indicators).
Through this process, a company or a brand can replace the generic avatar used in Gmail with their own logo. The image below shows an example before/after with Bank of America, one of Google’s partners in launching this new feature.

To do this, the company must use the DMARC (Domain-Based Message Authentication, Reporting, and Compliance) authentication protocol, which protects domain name holders from potential spoofing.
Additionally, the logo must be validated by a competent authority, such as Entrust Datacard or DigiCert. This authority then provides a Certificate of Authenticity, called a Verification Mark Certificate (VMC).

Finally, the email service must be compliant with the BIMI specification. This is currently the case with MailChimp, SendGrid, Valimail, Fastmail, Proofpoint, and Verizon Media. Google’s arrival will undoubtedly give a boost to this authentication process, and will further complicate the work of spammers and other phishing kings.

Source : The Google