Php Form not sending to exchange servers

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
I have a php form that sends a confirmation message to the form user and a message to the receipent. The form sends the confirmation message out to anyone no problem. But the actual message to the receipeints works fine to web mail address ie:gmail, yahoo, msn and other domains. When trying to send the same mail to users on an exchange server it does not work. No error messages, no junk mail, no outbox. Just disappears. If you do not know how to fix this, please do not bid, I have had three others build this form and it is still not sending to exchange servers.

Skills required:
PHP, Windows Desktop
About the employer:
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