Here is the procedure to send Sprint an email:
1) Log into My Sprint Wireless account via
http://www.sprint.com
2) Click on "Contact Us" (at the top of the page, after you are logged on)
3) Click on "Email us" (small in-line link within first paragraph; on click window closes and main window redirects to form)
4) Filled out form, selecting "Other" as the topic.