Read Google Makes GMail More Safer as ggogle announced on Google Blog..
Of course, it takes at least two people to send and receive an email, so it’s really important that other services take similar measures to protect your messages---not just Gmail. Unfortunately, not all email services do. And that’s why, starting this week in Gmail on the web, you’ll see two changes that highlight any affected messages:
- If you receive a message from, or are about to send a message to, someone whose email service doesn’t support TLS encryption, you’ll see a broken lock icon in the message.
- If you receive a message that can’t be authenticated, you’ll see a question mark in place of the sender’s profile photo, corporate logo, or avatar.