Google is adding a couple of new features to Gmail on the web this week that will help make your email experience safer. The first is a new notification when you're sending an email to a service that doesn't use TLS encryption, the second warns you when an email can't be authenticated.

From Google:

  1. 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.
  2. 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.

These tools will roll out to Gmail and Google Apps users over the course of the week.

Source: Google