“Many email providers don’t encrypt messages while they’re in transit. When you send or receive emails with one of these providers, these messages are as open to snoopers as a postcard in the mail. A growing number of email providers are working to change that, by encrypting messages sent to and from our services using Transport Layer Security (TLS). When an email is encrypted in transit with TLS, it makes it harder for others to read what you’re sending. The data here explains the current state of email encryption in transit….Encryption in transit helps protect your emails from being snooped on while they travel between you and your intended recipients. Unfortunately, billions of unencrypted emails are sent and received every day “in the clear,” presenting a prime target for eavesdropping and mass interception as they cross dozens of optical fibers and routers.”