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HELO/EHLO error when sending to comcast addresses

Posted on 2006-07-17
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Last Modified: 2012-08-14
I get an error anytime I (or anyone within my Exchange organization) sends an email to someone with a comcast address including replies.  We can send to all other addresses.  And can send to those addresses using other smtp or email accounts.  This is the error I get:

  *******@comcast.net on 7/17/2006 4:04 PM
            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            <geek3.Coakley.local #5.5.0 smtp;521-EHLO/HELO from sender 151.200.144.10 does not map to geek3.coakley.local in DNS>

How do I correct this?  I have checked the various blacklist sites, and I cannot find that we have been put on any of them.  I note that the difference in the DNS addresses above is geek3.Coakley.local versus geek3.coakley.local is the letter C in Coakley.  Is it case sensitive?  And if so how can I make this correction?  

Please give descriptive instructions as I am only a novice.  

Thank you for your help.
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Question by:aiasslug
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Sembee earned 1000 total points
ID: 17125629
Your SMTP banner is incorrect and will fail some tests.

Anything ending in .local will fail.

You need to correct your SMTP banner, your reverse DNS and forward DNS.
See my web site here: http://www.amset.info/exchange/dnsconfig.asp

Simon.
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Author Comment

by:aiasslug
ID: 17132969
Do I need to make any changes on the DNS server in my network?  Like the forward lookup zones or reverse lookup zones?  Or do I just need to contact Verizon to verify that our PTR and MX records match?
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LVL 104

Expert Comment

by:Sembee
ID: 17133023
Reverse lookup is set by your ISP, so you will need to contact them.
If your email is being delivered by SMTP then the forward DNS will be fine.

Changes to your internal network DNS are pointless - they will affect the internet.

Simon.
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