Exchange Relay vs rDNS & Static IP

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?
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cmb991Asked:
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PapertripConnect With a Mentor Commented:
If their server is the final hop before sending to the internet, then yes.
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Deepu ChowdaryCommented:
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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Deepu ChowdaryCommented:
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PapertripCommented:
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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cmb991Author Commented:
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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