MTA-STS

MTA-STS (Mail Transfer Agent-Strict Transport Security) is a security protocol that helps protect email communications between mail servers. It ensures that emails are transmitted securely over encrypted connections (like HTTPS), preventing hackers from intercepting or tampering with the messages. When a mail server uses MTA-STS, it can verify that the receiving server supports secure connections before sending an email. This adds a layer of trust and security, reducing the risk of email theft or spoofing, and helps ensure your messages stay private and secure during transfer.