Microsoft Exchange 2003 server, Outlook 2003, I can't receive emails but can send email out.

Exchange 2003 server, Outlook 2003, I can't receive emails but can send emails out.  I get this error message reason: 550. has been blocked by abcoxu.  I saw this message when I sent the email to my outside account (gmail).
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Alan HardistyConnect With a Mentor Co-OwnerCommented:
It is most likely because you are listed on SORBS (a blacklisting website).
Address: Record Created: Sat Jun 23 05:13:31 2007 GMT Record Updated: Sat Jun 23 05:13:31 2007 GMT Additional Information: [ Submitted via: Spam 'o Matic ] Received: from ( []) by (Postfix) with ESMTP id 7764A1142C for <[email]>; Fri, 01 Jun 2007 22:34:20 +1000 (EST) Currently active and flagged to be published in DNS If you wish to request a delisting please do so through the Support System.
You system(s) may be infected .
Run a full scan of all machines, clock outgoing email from any internal computer other than any mail servers you have and once satisfied you are clea, check on to see if you have been removed from SORBS.
Alan HardistyCo-OwnerCommented:
A good tool for checking nasties in addition to Anti-Virus is Malwarebytes  Just download the free version.
The listing above is 5 days old, so it could be that someone from AOL has just reported you for receiving a message that was not spam, but they felt was spam.
Either way, visit and request a de-listing.
Do you have any firewall ?

Have you set your Exchange Server MX record on your DNS?
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This happens only with GMail or with all emails that they send you ?
Can you provide us with a test mail address ?

Have you configure you SMTP for incoming mails ?
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Also Check these :

Hope that helps !
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