Reverse DNS Error when emailing

When replying to a craigslist posting, I get the bounce message below and need to know how to fix this.

There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.  <mail.ehclifebuilders.org #5.5.0 smtp;554 <unknown[65.160.142.109]>: Client host rejected: rDNS/DNS validation failed. Please setup matching DNS and rDNS records: http://bind8nt.meiway.com/itsaDNSmess.cfm>

I have these DNS entries set with my ISP:
ehclifebuilders.org.              IN      MX      5       mail.ehclifebuilders.org.
mail.ehclifebuilders.org.       IN      A                 65.160.142.109

What am I missing?
supprtengAsked:
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Chris DentConnect With a Mentor PowerShell DeveloperCommented:

You're missing the Reverse lookup record:

109.142.160.65.in-addr.arpa.  PTR  mail.ehclifebuilders.org.

Your ISP should be able to add it for you, it's extremely unlikely that they've delegated that into your direct control.

Chris
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cshepfamCommented:
seems as though you have all types of issues with your server.  do an smtp diagnostic test and see for yourself:

http://mxtoolbox.com/diagnostic.aspx


to fix your reverse dns issue, create a reverse lookup zone for your mail server.  you want a NS record for mail.ehclifebuilders.org in that zone.


then open up your command prompt and do an ipconfig /flushdns, ipconfig /registerdns command.


It says your server is an open relay as well.  Close that out by following this:  (assuming you have exchange 2003)


http://www.petri.co.il/preventing_exchange_2000_2003_from_relaying.htm

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cshepfamCommented:
per chris-dent's response, if your ISP is hosting your email, then yes, contact them.  
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Chris DentPowerShell DeveloperCommented:

It's not so much whether they're hosting mail or not.

ISPs very rarely delegate responsibility for Reverse Lookup Zones. It only happens when explicitly requested (if then).

Because you have no responsibility for 65.160.142.109 yourself (you just loan the IP from your ISP) they're the ones that have to add the reverse lookup records.

Chris
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supprtengAuthor Commented:
Chris-Dent got the answer I needed.  

cshepfam - thanks for the links.  odd though, i've run relay test on other sites and they weren't allowed to relay.  i'll follow the info.  

Thanks for everyone's replies.
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