James,
It's easier if you make your jar file "executable" by adding this line to the META-INF/MANIFEST.MF file inside the jar:
Main-Class: com.home.rptsendmail.v2.SystemStart
and then run it with:
java -jar RptSendMail-2.0.0.jar
see
The Jar File Tutorial If you want to ship the javaMail stuff alongside your jar, use the manifest's Class-Path: entry like this (this may not be permissible by Sun though, so check the license carefully)
Download extensions are specified in the Class-Path header field in the manifest file of an applet, application, or another extension. A Class-Path header might look like this, for example:
Class-Path: servlet.jar infobus.jar acme/beans.jar
With this header, the classes in the files servlet.jar, infobus.jar, and acme/beans.jar will serve as extensions for purposes of the applet or application. The URLs in the Class-Path header are given relative to the URL of the JAR file of the applet or application.
Otherwise, just unjar all the classes you need and bundle them directly in your .jar (no nested jar files).