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9.0

Reverse DNS - confusion

Asked by c00kie88 in Domain Name Service (DNS)

Hi All,

Please help..

I have an exchange server (MX record = 100.1.1.31). When we send email to external people, it sends as 100.1.1.30 instead of 100.1.1.31 IP address..
100.1.1.30 is my cisco asa external ip address...
Recently we have a problem sending email to this company as this company is running very strict filter and doing a forward and reverse lookups using DNS for every incoming emails.

When we sent an email to this company, the error as below:

Your message did not reach some or all of the intended recipients.

      Subject:             TEST - PLEASE REPLY IF YOU RECEIVE THIS
      Sent:                 1/09/2009 9:57 AM

The following recipient(s) could not be reached:

      blah@BBB.com on 3/09/2009 12:53 PM
            The e-mail system was unable to deliver the message, but did not report a specific reason.  Check the address and try again.  If it still fails, contact your system administrator.
            < postmaster.XXX.com #4.0.0 X-Spam-&-Virus-Firewall; host smtp.BBB.com[25.25.0.3]    said: 450 4.7.1 Client host rejected: cannot find your hostname,    [100.1.1.30] (in reply to RCPT TO command)>

The technician told me because they can't find a reverse lookup for postmaster.XXX.com.
My questions are:

1. Do you set up reverse lookup for the ASA (100.1.1.30) or the mail server(100.1.1.31)?

2. postmaster.XXX.com is just a name that i set up for bounced error message..

3. How reverse DNS lookup actually work? in this case, what actually they are checking ?

Any advise pls...

So confused...

thank you

c00kie


[+][-]09/04/09 02:55 AM, ID: 25257989Accepted Solution

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Zone: Domain Name Service (DNS)
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Solution Provided By: Mestha
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Solution Grade: A
 
[+][-]09/04/09 01:52 AM, ID: 25257750Expert Comment

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[+][-]09/07/09 06:29 AM, ID: 25274925Expert Comment

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