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Thread: [SOLVED] Delivering Mail to another LAN mail host.

  1. #1
    jeffbearer is offline Intermediate Member
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    Default [SOLVED] Delivering Mail to another LAN mail host.

    ZCS is setup behind a firewall with all the necessary ports forwarded. Bind is running on the ZCS to tell it that it's internal ip address resolves to it's external name. That stuff all works fine.

    I have a second host that I want to deliver mail to on the internal network. It is not on the same dns zone that is configured on the local bind and I have a forward zone set up on the ZCS to get the data about my other internal zone.

    ZCS is able to resolve it using it's resolv.conf hitting the local Bind and getting the forwarded zones from the internal dns servers. It can ping the host and everything looks fine.

    When I try to send a mail using my SMTP client to ZCS the mails get deferred with the error "No Route to Host" But that isn't true from the Linux under ZCS's point of view. So I'm not sure what to do next.


    • ZCS Hostname: mail.mycompany.com
    • Internal DNS Zone: something.com
    • Host I'm trying to send mail to:help.something.com
    • Email: support@help.something.com


    ZCS Bind configs:
    Code:
    zone "mail.mycompany.com" {
            type master;
            file "/etc/bind/db.mail.mycompany.com";
    };
    
    zone "mycompany.com" {
            type master;
            file "/etc/bind/db.mycompany.com";
    };
    
    zone "something.com" {
            type forward;
            forwarders { 10.0.0.53; };
    };
    Error:
    Reason: connect to help.something.com[10.0.0.120]:25: no route to host
    Any suggestions would be appreciated.

  2. #2
    uxbod's Avatar
    uxbod is offline Moderator
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    Quote Originally Posted by jeffbearer View Post
    internal ip address resolves to it's external name
    Why ? If you are port-forwarding what does it matter as-long as your MX, rDNS etc are fine externally. Please post the following
    Code:
    cat /etc/hosts
    cat /etc/resolv.conf
    dig yourdomain mx
    dig yourdomain any
    host `hostname` <- note backticks and not single quote
    Are you able to telnet to the other server on port 25 ?

  3. #3
    jeffbearer is offline Intermediate Member
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    Why ? If you are port-forwarding what does it matter as-long as your MX, rDNS etc are fine externally. Please post the following
    I inherited the config, and was told it was because of the Split DNS stuff.

    If that is not necessary then I'd be happy to wack this dns fakey stuff on the zcs.


    Are you able to telnet to the other server on port 25 ?
    Son of a Gun, the no route error threw me instead of connection refused. The port is closed. I thought I had tested that, but I must of been on localhost of that server and not a 3rd party.

    Thanks.

  4. #4
    uxbod's Avatar
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    Please mark as solved if you have resolved the issue

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