This document describes the two XSL options in What is XSL?.("TestReceiver"). XSL allows you to extract almost any information from a TLS email SMTP session. Using XSL does require you to be familiar with TestReceiver, its XML Output Formats, XML itself, and XSL(T). See
What XSL Does
XSL is a way to extract the fields you want from the output of TestReceiver. First you configure TestReceiver to output the field(s) you want in XML, then you use XSL to translate that XML into just the XML you want.
How To Use It