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This error code typically means you are blocked. Use the link below to check you mx record and make sure you have reverse dns setup and can also check blacklists. Also try to telnet &nbsp;from your email server to port 25 on the destination server and see what response you get.<br />
<br />
<a href="http://www.mxtoolbox.com/" rel="ugc">http://www.mxtoolbox.com/</a>
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This error code typically means you are blocked. Use the link below to check you mx record and make sure you have reverse dns setup and can also check blacklists. Also try to telnet  from your email server to port 25 on the destination server and see what response you get.

http://www.mxtoolbox.com/ [http://www.mxtoolbox.com/]

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I used the Link you sent and we do not have revers DNS setup and No MX records. How do I setup revers dns? I have never done that before. 
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I used the Link you sent and we do not have revers DNS setup and No MX records. How do I setup revers dns? I have never done that before.

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Thanks<br />
It seems to be working.
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&quot;Thank you for your help that worked.&quot; Sounds like points should be awarded rather than the question deleted.
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"Thank you for your help that worked." Sounds like points should be awarded rather than the question deleted.

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Hi<br />
We are getting a message 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;mail.stjohnocala.org #5.5.0 smtp;571 Delivery not authorized, message refused&gt;<br />
<br />
I have checked and we are not on any black list. If there is any thing else that I can try please let me know.<br />
Thanks
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Hi
We are getting a message There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            <mail.stjohnocala.org #5.5.0 smtp;571 Delivery not authorized, message refused>

I have checked and we are not on any black list. If there is any thing else that I can try please let me know.
Thanks

SMTP: 571 Delivery not Authorized, message refused

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.

Email Protocols

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.