Can Exchange 2003 on SBS 2003 receive email on its own if the POP3 Connector is enabled too?

I've got a customer who uses their POP3 connector to pop their mailboxes at their web host. Their ISP is AT&T though. Their web host is going to take mail down this weekend for maintenance and I want to know if I can employ a second MX record that will deliver mail directly to this customer's Exchange server and if I do that is there anything else I need to do in Exchange to enable it to actually receive the inbound mail that arrives?

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TG TranIT guyCommented:
Nothing else since Exchange's SMTP is already prepared to receive email for the domain

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