![]() One cause of confusion around the names of these different technologies is that some email software incorrectly uses the term TLS when they should have used STARTTLS. Current software supports TLS v1.0, TLS v1.1, and TLS v1.2, and many sites and services now strongly recommend at least TLS v1.2 for its overall improved security profile. SSL has been officially deprecated (as of May 2018) and is no longer in use by modern online services. While almost all online services support SSL/TLS today, not all services support the newest TLS v1.3. This might mean that if the server supports the newest TLS v1.3, but the email client connecting to the server only supports TLS v1.1, both sides might use TLS v1.1. When a connection is made to a port that has SSL or TLS, or when an insecure connection is upgraded to secure by STARTTLS, both sides of the connection will agree on a particular version depending on what is supported. The version numbers of SSL and TLS in order from oldest to newest is: STARTTLS helped to reduce this risk by taking an existing insecure connection and upgrading it to a secure connection that used SSL/TLS. This put personal information in danger of being stolen. Before encryption was standard, many connections between an email client and the server were done insecurely. The terms SSL and TLS are often switched and used interchangeably. It is supported by all modern and secure systems that handle internet traffic, including Fastmail. This prevents any third parties from spying on these communications. SSL and TLS are the standard technology to encrypt connections between two computers. ![]() ![]() ![]() If you are looking for information on setting up your email client, please go here. This is an informational page about the history of SSL, TLS, and STARTTLS and the differences between these protocols. ![]()
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