The mailDoc() or mailMsg() methods using strings for the mail body.
To include the values of fields in the body you'll have to create a custom script.
You can try a macro I desiged for this purpose.
It allows you to create a message and place variables into that message that will be filled with data from fields.
http://thelivecycle.blogspot.de/2012/05/mailto-maker-marco-v1.html