TLS encrypts email connections between servers and clients. Learn how TLS works for SMTP and why it matters for security and trust.
TLS (Transport Layer Security) is a protocol that encrypts data in transit between systems, including email servers and clients. In email, TLS often protects SMTP connections so messages are harder to intercept while traveling across networks.
Many providers use STARTTLS to upgrade an SMTP connection to an encrypted one when supported. While TLS doesn’t stop phishing by itself, it improves privacy and integrity during transmission.
For organizations, enforcing TLS where possible reduces risk, especially for sensitive mail. It’s also a trust signal in many security reviews, since it shows you’re not sending messages over plain, easily intercepted connections.