Need to Connect iPhones to Exchange 2003

I have some users with iPhones connecting to an Exchange 2003 Server via IMAP. However, they are unable to send mail through the Exchange account.

Is there a better way to connect the iPhones to the Exchange Server?
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mcse_plusAuthor Commented:
Users connecting via IMPA with ATT are using ATT's ( for outgoing mail and they are ok.
Users connecting via IMPA with Verizon cannot send using the Exchange Server for Outgoing and Verizon does Not provide SMTP servers.
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