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Facebook announced Tuesday that 95 percent of the notification emails it sends out are now being encrypted using STARTTLS — the extension used to encrypt insecure network connections between mail providers. Facebook singled out Microsoft and Yahoo as being major email providers who have since backed the extension, which requires compliance from both the email clients that send emails and those that receive them. Back in May, Facebook released a study on whether or not mail providers were using the extension and found that only 28.6 percent of the company’s outbound notification emails were being encrypted, meaning not very many services were correctly using STARTTLS.