Exchange 2003 - Problem: Internal forwarding of external e-mail

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The factors are: Exchange 2003 Standard in SBS 2003 R2 / Domain is
@XXX.local / Used for internal e-mail for 25 users / POP3 is setup on
5 clients to connect to ISP for external e-mail / An SMTP address for
the external e-mail has been setup in AD with it being set as
primary. / On the client, Exchange is set as primary / Exchange is set
use DNS

All of this seems to work fine. The issue comes when an external e-
mail is received by the internal client (with or without attachments)
and then is 'forwarded' to an internal recipient. When doing so the
forwarded e-mail is actually sent out through the POP3 connection
rather than through the Exchange server. I then of course get an NDR
specifying that it was caught as spam and expectedly shows the sending
e-mail address of @XXX.local.

Can anyone point out a fix for this. This is an office that relies
heavily on this function. When the information is cut and pasted into
a new e-mail for the internal recipient the e-mail goes fine. However,
some of these forwarded e-mails include several attachments and
cutting and pasting is not a viable option.
.

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