Facebook, Twitter mail is not 100% secure

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.

According to Google Transparency Report a growing number of email providers are working to change that, by encrypting messages sent to and from gmail 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 below explains the current state of email encryption in transit.

How much email was encrypted in transit?

Generally speaking, use of encryption in transit increases over time, as more providers enable and maintain their support. Factors such as varying volumes of email may explain other fluctuations.

Who supports encryption in transit

Below is the percentage of email encrypted for the top domains in terms of volume of email to and from Gmail, in alphabetical order.

Domain	%
From: amazon.{...} via amazonses.com	99.9%
From: amazonses.com	99%
From: aweber.com	99%
From: facebookmail.com via facebook.com	99.99%
From: groupon.{...}	100%
From: grouponmail.{...}	99.99%
From: indeed.com	99.99%
From: pinterest.com	100%
From: sailthru.com	> 95%
From: twitter.com	99%