Inbound email problem

I am running SBS 2003 Standard on a Dell PowerEdge 1800 with 2 NICs.
External NIC is connected to Qwest provided Actiontec GT701WG modem/
router. I can RWW, I can send email, I can receive pop mail for our
qwestoffice email addresses. I cannot receive inbound email if it is
sent to our company domain name address. I have a public static IP
with MX and A records setup. When I used dnsstuff to obtain a dns
report, the report indicated fail at connect to mail servers (Error: I
could not complete a connection to any of your mailservers) When I
did an email test I received the error "The mailserver terminated the
connection before the transaction was complete (state1). This is not
RFC compliant, and therefore either due to an error, or it may be the
result of a non-RFC-compliant mailserver or non-RFC-complaint anti-
spam program.

Any insight on what is creating my problem would be greatly
appreciated.
.

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