\documentclass{article}
\usepackage{docassembly}
\usepackage{lipsum}

\hypersetup{pdfpagemode=UseNone}

% Look in the Adobe Acrobat JavaScript manual under the doc.mailDoc to see all the possible parameters.
\begin{docassembly}
% Prior to sending this document, you can attach files this this PDF
% Refer to attach-files.tex
var retn = \attachFile({
  cName: "AdobeDon",
  cDIPath: "graphics/AdobeDon.pdf"
});
% The next line creates a meaningful description of the attachment
if (retn) this.getDataObject("AdobeDon").description="The one and only AdobeDon";
\executeSave();
\mailDoc({
  bUI: false,
  cTo: "dpstory@hotmail.com",
  cSubject: "I'm testing things out",
  cMsg: "Good to hear from you again Don. I'm emailing this PDF, attached, for your review."
});
%\executeSave();
\end{docassembly}

\begin{document}

\lipsum[1-30]

\end{document} 