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Have a look at this <br />
<br />
<a href="http://support.microsoft.com/kb/300171/en-us" rel="ugc nofollow">http://support.microsoft.com/kb/300171/en-us</a><br />
<br />

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Have a look at this

http://support.microsoft.com/kb/300171/en-us [http://support.microsoft.com/kb/300171/en-us]



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

Cannot send emails to certain domain names

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.