troubleshooting Question

Cannot send emails to certain domain names

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mkurtzhals asked on
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      There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            <smtp.mycomp.com #5.5.0 smtp;550 Broken sender rDNS: no host name found for [734.34.17.34]>
Any ideas, obviously i changed the server name and ip

thanks
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