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Check your Antivirus updates.<br />
If your server is sending spam, automatically this problem will arise again.<br />
So 1st check why you have been blacklisted by following the links in the results of blacklists.
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Check your Antivirus updates.
If your server is sending spam, automatically this problem will arise again.
So 1st check why you have been blacklisted by following the links in the results of blacklists.

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Check this once :<br />
<br />
<a href="http://technet.microsoft.com/en-us/library/aa998662.aspx" rel="ugc nofollow">http://technet.microsoft.com/en-us/library/aa998662.aspx</a>
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Check this once :

http://technet.microsoft.com/en-us/library/aa998662.aspx [http://technet.microsoft.com/en-us/library/aa998662.aspx]

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Depending on how the relay server is setup will dictate whether or not you need a static IP and PTR record to relay through them -- ask them or check their FAQ's -- if you are able to relay through them now then that should be a non-issue. &nbsp;As far as your blacklist problem, the mail will be coming from the Comcast server so that is the IP that will need a valid PTR record.
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Depending on how the relay server is setup will dictate whether or not you need a static IP and PTR record to relay through them -- ask them or check their FAQ's -- if you are able to relay through them now then that should be a non-issue.  As far as your blacklist problem, the mail will be coming from the Comcast server so that is the IP that will need a valid PTR record.

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Papertrip: so since we are using them as a relay, it's their ip were using so even though our ip is on pbl, it doesn't matter? 
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Papertrip: so since we are using them as a relay, it's their ip were using so even though our ip is on pbl, it doesn't matter?

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<div class="content wysiwyg-content">
We have exchange 2010 setup with an smtp relay to comcast business smtp server. &nbsp;I checked our IP and it still comes up on PBL. &nbsp;My question is if we have an smtp relay setup to comcast smtp servers, do we need to setup rDNS and a Static IP or does the mail go off comcast smtp servers ip and not our WAN IP?
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We have exchange 2010 setup with an smtp relay to comcast business smtp server.  I checked our IP and it still comes up on PBL.  My question is if we have an smtp relay setup to comcast smtp servers, do we need to setup rDNS and a Static IP or does the mail go off comcast smtp servers ip and not our WAN IP?

Exchange Relay vs rDNS &amp; Static IP

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.

Exchange

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Exchange Relay vs rDNS &amp; Static IP

Exchange Relay vs rDNS & Static IP