Incorrect "Time Stamp" on email forms

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Running Filemaker 5 Unlimited on IIS5 and a Linux/Apache machine running SendMail, all forms submitted from a Filemaker webpage that send an email get "timestamped" with a time that is 5 hours ahead of the actual time.

All mail forms sent from the same machine using a web browser or cgi form page get stamped with the proper time, only the filemaker form pages are stamped incorrectly. (The mail comes right away, it is just stamped that it was sent 5 hours later)