We'll need more information, such as OS, version of Acrobat/Reader is being used, what email client is being used, etc. Email is generally unreliable and not secure, adn whether is works seamlessly depends on whether the client machine is set up correctly.
Submitting to a web server is a more reliable approach that can be made secure relatively easily.
I'm using Windows XP. Acrobat Reader X. Most of our email clients are Microsoft Outlook. We have a form that get's sent by our salesreps via email all the time with no problems. I want to be able to do the same.
YAY... We figured it out. Turns out, our test person wasn't using MS Outlook... All is good in the world of Outlook... I'm thrilled!!!