Google revealed today that it has added a new Safer Email section to its Transparency Report in order to document the percentage of outbound and incoming Gmail messages that are encrypted.

According to the company, 65 percent of Gmail messages sent to other email providers over the past 30 days were encrypted during transit. Meanwhile, 50 percent of messages from other providers sent to Gmail accounts employed Transport Layer Security (TLS).

Screen Shot 2014-06-03 at 1.09.03 PM

The report also highlighted the top domains sending to and receiving from Gmail and their respective encryption rates. Amazon’s marketing email service is the top inbound domain, while is the top outbound. Constant Contact and showed up as major domains that lack transport encryption when communicating with Gmail.

Email encryption in transit [Google Transparency Report]

Related: Google launches Chrome extension End-to-End for sending and receiving encrypted emails in the browser