The infopath form is published to sharepoint 2007.
I have configured a custom submit button which sends an email to the value based in a text box. When that value is an internal mail address ie Me@mycompnay.com the submission goes through, but when the text box value is an external e-mail address ie email@example.com the user is prompted with an error:
Some rules were not applied
The form cannot be submitted because of an error
This error occurs both in infopath filler and the browser.