How does TLS contribute to email security?

TLS, or Transport Layer Security, plays a crucial role in enhancing email security primarily by encrypting email during transit. This encryption ensures that emails remain private and confidential as they travel over the internet, protecting sensitive information from being intercepted by unauthorized parties.

When an email is sent from one server to another, it can potentially pass through multiple intermediary servers. Without encryption, this data can be exposed to anyone who has access to those servers or networks. TLS addresses this risk by creating a secure channel, allowing the email's contents to remain unreadable to anyone other than the intended recipient.

Encryption via TLS also helps in verifying the authenticity of the email sender and the integrity of the message. This means that the recipient can be more confident that the email they receive has not been altered in transit and is genuinely from the expected source.

The other options present functions that do not relate to email security or the role of TLS specifically. For instance, compressing email sizes or organizing them into folders pertains more to efficiency and user interface aspects of email systems rather than security mechanisms. Enhancing the design of email templates relates to aesthetics and user engagement, which do not impact the security of the message during transmission.