Put this Tango query document somewhere in your Web server folder and call it through whatever convention you normally use to invoke Tango documents. When called without search arguments it returns a simple form to demonstrate Emailing through Tango.
Currently, it expects the program MondoMail.fat to be in the location :cgi-bin:MondoMail.fat. This path is relative to the Tango CGI, so the cgi-bin folder would have to be in the same folder as Tango. If you can't support this set-up, just edit the Query document with the proper, Tango-relative path.
To use MondoMail from your own Query documents, copy the AppleEvent Action from within this document into your own, and change the field names as required.