The Distribute command requires and email address to return form data. If you're not looking to receive the form data, you can simply reader-extend the form and then use your email program to send out the form.
There is an undocument tip to remove the Document Message Bar in this discussion that involved the use of JavaScript:
http://answers.acrobatusers.com/Acrobat-XI-hide-purple-fill-forms-banner-q103507.aspx
Otherwise the appearance of the Document Message Bar is at the discretion of each end user under Edit > Preferences > Forms " Always hide form document message bar".
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