As far as I know, TLS version support depends on the java version you're using, and is provided starting Java 8.
Please check which Java version you're using, and upgrade as neccesary.
Also, I suggest you download and install the latest javamail version.
See http://www.tersus.com/#Id=241 & http://www.tersus.com/#Id=242 for some details on where to download and install these components.
For best results, use the Firefox browser..