TLS Minimum Version

After applying Patch 3, you can specify one of four minimum TLS protocol versions for inbound and outbound mail if your TLS certificates are configured.

The minimum TLS version you select is the minimum level you want to require for inbound and outbound TLS messages. ZixGateway always connects at the highest level available, but no lower than the minimum level specified.

The choices for this field are:

ZixCorp recommends that you always set your minimum TLS version to the highest possible setting that your environment supports to ensure the security of your email communication.