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What are you trying to do? &nbsp;What do the error messages look like? &nbsp;What kind of IP space are you trying to set a mail server up in? &nbsp;Like off a consumer DSL or Cable modem connection?
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What are you trying to do?  What do the error messages look like?  What kind of IP space are you trying to set a mail server up in?  Like off a consumer DSL or Cable modem connection?

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I have a mail server setup at a colo (merak mail server). you are able to do a Reverse DNS on the domain (www.domain.com) and the sub-domain(mail.domain.com<wbr />). &nbsp;I am trying to send email to people with aol.com, yahoo.com, and hotmail.com (user@hotmail.com). &nbsp;<br />
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The email get sent, but after a while they are being bounced back to the sender after being rejected by the companies servers. &nbsp;I do not have a SPF record yet, and wonder if I need that setup. &nbsp;An example of an error I got was from hotmail: <br />
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----- Transcript of session follows -----<br />
.. while talking to mx1.hotmail.com<br />
&gt;&gt;&gt;&nbsp;MAIL From:&lt;USER@DOMAIN.com&gt;<br />
&lt;&lt;&lt;&nbsp;550 DY-002 Mail rejected by Windows Live Hotmail for policy reasons. The likely cause is a compromised or virus infected server/personal computer. If you are not an email/network admin please contact your E-mail/Internet Service Provider for help. Email/n<br />

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I have a mail server setup at a colo (merak mail server). you are able to do a Reverse DNS on the domain (www.domain.com) and the sub-domain(mail.domain.com).  I am trying to send email to people with aol.com, yahoo.com, and hotmail.com (user@hotmail.com).  

The email get sent, but after a while they are being bounced back to the sender after being rejected by the companies servers.  I do not have a SPF record yet, and wonder if I need that setup.  An example of an error I got was from hotmail:

----- Transcript of session follows -----
.. while talking to mx1.hotmail.com
>>> MAIL From:<USER@DOMAIN.com>
<<< 550 DY-002 Mail rejected by Windows Live Hotmail for policy reasons. The likely cause is a compromised or virus infected server/personal computer. If you are not an email/network admin please contact your E-mail/Internet Service Provider for help. Email/n


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I am getting email bounce backs from AOL, Yahoo, Hotmail. &nbsp;What is the propery way to setup a mail server.
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I am getting email bounce backs from AOL, Yahoo, Hotmail.  What is the propery way to setup a mail server.

Configuration to send to AOL Yahoo

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Software

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Networking

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