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Getting Undeliverable: Connection refused due to abuse

I am the IT person for Company A. tries to send an email to  User@CompanyB gets an undeliverable reply indicating the following:

From:   System Administrator  
Sent:   02/04/2008 8:51 AM
Subject:        Undeliverable: FW: Delivery Status Notification (Failure)

Your message did not reach some or all of the intended recipients.

      Subject:  FW:
      Sent:     02/04/08 8:51 AM

The following recipient(s) could not be reached: on 02/04/08 8:51 AM
            You do not have permission to send to this recipient.  For assistance, contact your system administrator.
            < #5.7.1 smtp;550 5.7.1 < >... H:MXB[]Connection refused due to abuse>

I am not sure how to interpret the message above.  To me it looks like the smtp server of CompanyB rejected email to domain "CompanyB" due to abuse.  Please let me know where the problem lies and how to correct it.  Company A's email is hosted by Covad.  I don't know anything about Company B's email system.  Thanks.
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I was about to post, with the direct opposite interpretation....

"The following recipient(s) could not be reached: on 02/04/08 8:51 AM "

... looks to me that the bounce message goes to the and is about a failed message to

The principle is the same, however... the admin in charge needs to review the spam filter or equivalent in the recipient's mail server.
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That's the main reason why I posted this question, I wasn't sure how to interpret the undeliverable message.  I checked CompanyA's mail accounts under and spam filtering is turned off.  Per war1's suggestion, I emailed the user of Company B that received the undeliverable message to advise their IT person that the problem is on their side.  
Well, depending on other factors (new problem, user-specific etc?) it could be that the receiving-end server rejects because there is a problem with the sending server HELO greeting and/or its DNS records or something like that; any decent server can reject messages based on such criteria and no other spam filtering needs to be in effect.