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Thread: [SOLVED] client host rejected

  1. #1
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    Default [SOLVED] client host rejected

    Hello,

    I have 2 servers, mail is zimbra and the web has postfix to deliver the mails that are submitted via the web, I checked the option reject_unknown_client in order to force zimbra to check the reverse DNS, I noticed that when the visitor has submitedan inquiry the postfix must deliver to zimbra server but I'm getting the following error from the web postfix:
    host mail.domain.com[192.168.0.2] said: 450 4.7.1 Client host rejected: cannot find your hostname, [192.168.0.3] (in reply to RCPT TO command)
    so how do I force zimbra to check the rDNS from the none local emails, or is there another solution to make the rDNS in the web?

    Please note that the 192.168.0.2 is the mail server and 192.168.0.3 is the webserver.
    - In a world without walls and fences who needs windows and gates?
    - I am Running Linux.. Finally, my PC is valid & Reliable Hereafter.

  2. #2
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    I'm assuming you're using a Split DNS setup? Why not just setup a reverse DNS entry for your web server internally?

  3. #3
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    yes I'm using the split DNS, bind9 on ubuntu 8.4 for mail and bind9 on ubnut 9.4 for web

    can you provide the entry plz and where I should insert it? in the web or mail?
    - In a world without walls and fences who needs windows and gates?
    - I am Running Linux.. Finally, my PC is valid & Reliable Hereafter.

  4. #4
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    So.. you have two bind servers? If that's the case, you'll have to update it on both.

    There are plenty of tutorials out there for setting up reverse DNS in bind. Here's one: DNS - Bind9 - Wiki

  5. #5
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    I'm using this entry in my bind configuration,
    2 IN PTR server.domain.com
    and still the same error, do you know the linux command that show you the server name when you pass the IP address? "rDNS lookup"
    host -t mx domain.com
    will show you the handler mx of domain, but when I wanna the reverse way via linux how?
    - In a world without walls and fences who needs windows and gates?
    - I am Running Linux.. Finally, my PC is valid & Reliable Hereafter.

  6. #6
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    Code:
    dig -x 192.168.0.3

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