I created a fillable pdf form yesterday that includes a submit email button. I worked around the fact that it wanted to send an xml file instead of a pdf file. It works fine in pre Reader 9 versions but Reader 9 wants to send back a data file not the actual pdf file. Any ideas as to how to work around this issue? I've already changed
<submit format="xml" textEncoding="UTF-8" target="mailto":/>
<submit format="pdf" textEncoding="UTF-8" target="mailto":/>
which worked out fine until I tested it in Reader 9
Have you tired the Acrobat menu items "Advanced => Enable Usage Rights in Adobe Reader"?
This action will allow the user with Adobe Reader save the filled in form, and the ability to save the completed form is needed to be able to email the completed form.