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  1. #1
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    SBS 2203 Exchange issues

    I am running exchange and occasionally get some e-mails that bounce back to me saying
    Host name (PTR) associated with address xx.xxx.xxx.xxx is missing or does not point back to original IP address.
    I used MX tools to look up our Domain and it says I do have a rDNS, I also get this from MX tools
    Not an open relay. <<<This is good
    0 seconds - Good on Connection time <<<This is good
    0.094 seconds - Good on Transaction time <<<This is good
    Reverse DNS FAILED! This is a problem. <<<This is bad
    Warning - Reverse DNS does not match SMTP Banner <<<This is bad
    I think my problems is my e-mail server is name the same as my website. But not sure.

    I have read that i should have my e-mail smtp saying mail.example.com instead of example.com

    Totally Lost on how to fix

    Thank You
    Last edited by Jeff S; 2011-01-29 at 01:58. Reason: mispelling

  2. #2
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    Jeff, your email needs an MX record for others to be able to send you mail. This is added to your DNS and when others look up the MX record they get an IP address to send the email to. rDNS is asking the DNS for the domain name associated with that IP. The DNS and rDNS lookup should match for your email to be considered reliable.

    Does your mail server use the same IP as your web site? If not you should create a new email domain DNS record (mail.domain.com) that matches the email server IP and then change your MX record to the new domain name.

    You should also consider adding an SPF record to your DNS.

    cheers, Paul

  3. #3
    New Lounger
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    Hi Paul,

    I do have MX records setup through securence that handles my spam that comes into my e-mail server. I also have SPF record setup.
    My e-mail ip is different tehn my website domain.

    My e-mail and webiste have the same domain name though. I could give you my domain name.
    I used mxtools to try and decipher the probelm, but still not sure what i did wrong.


    Regards,
    Jeff

  4. #4
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    Nothing wrong, but you should create a new domain name for your email server. You need the DNS record for the mail server to point tot he IP address you use for the mail server.

    How Microsoft do it.
    Code:
    microsoft.com		A	207.46.232.182
    microsoft.com		MX	mail.messaging.microsoft.com
    mail.messaging.microsoft.com		A	216.32.180.22
    As you can see, the mail server - MX record - is using a different IP to the web site, so the DNS entries are set as required.

    cheers, Paul
    Last edited by Paul T; 2011-01-30 at 03:03.

  5. The Following User Says Thank You to Paul T For This Useful Post:

    Jeff S (2011-01-30)

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