What does “Official” in Proton Mail emails mean?

The Official badge in Proton Mail emails verifies that the email is a genuine message from Proton.

Phishing attacks(new window) are one of the main online threats, so you need to watch out for fake messages pretending to be from people you trust. 

To help you identify legitimate emails from Proton:

• We now mark all new emails from us with the Official badge instead of starring them.
• Older messages from us will remain starred in your mailbox.