troubleshooting Question

#5.5.0 smtp;521 - EHLO/HELO from sender [ip address] does not map to [] in DNS

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vladpaliy asked on
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Recently switched to another ISP. Updated the MX record with the web hoster accordingly. Now, emails to comcast addresses (in particular), result in the following:

[recepient] on Sun, 17 Sep 2006 21:59:47 -0700
    There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
    < #5.5.0 smtp;521-EHLO/HELO from sender does not map to in DNS>I'

I've looked at some related articles on google, but none seem to give me step-by-step (detailed) instructions on how to get it resolved. If anyone has any suggestions here, I would appreciate it.  Thanks.

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