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Thread: Changing SMTP MTA port

  1. #1
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    Default Changing SMTP MTA port

    Is it possible to change the default smtp port (ie 25) for something else ?

    It will be great because lot's of ISP block the 25 IP Port...

    Thanks

  2. #2
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    Default

    The MTA runs on 7075 and is mapped to port 25 via iptables. So you can try working with 7075 and see if that avoids your ISP's filtering.

    -kevin

  3. #3
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    Default

    Is there any document you have that will allow me to (heavily) firewall this system from the internet?

    Thanks,

    Bob

  4. #4
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    Default Port information-

    Quote Originally Posted by bob_p
    Is there any document you have that will allow me to (heavily) firewall this system from the internet?

    Thanks,

    Bob
    The ports that we use are listed here:
    http://www.zimbra.com/forums/showthread.php?t=5

    So, as long as those are available (just the mapped ports), you won't have any unused ports open.

    Also, you'll want to plan you service according to your security concerns - offer only SSL enabled services to the public network, etc.

  5. #5
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    Default

    Thanks for the info.

    My next question is where can I DISABLE your iptables firewall rules? I would like to incorporate these with our standard Shorewall ruleset to make the installation a lot easier and more more uniform?

    We have a RHEL4 (CentOS) kickstart CD we use, and I would love to figire out how to incorporate this into that CD.

    Thanks,

    Bob

  6. #6
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    Default iptables

    Quote Originally Posted by bob_p
    Thanks for the info.

    My next question is where can I DISABLE your iptables firewall rules? I would like to incorporate these with our standard Shorewall ruleset to make the installation a lot easier and more more uniform?

    We have a RHEL4 (CentOS) kickstart CD we use, and I would love to figire out how to incorporate this into that CD.

    Thanks,

    Bob
    The iptables rules are installed with the script /opt/zimbra/bin/zmiptables - the option to remove the rules is -u.

  7. #7
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    Angry Port 25 is being blocked at some confrences

    I was just called by the CEO of our company, needed to know which alternate port I can configure Zimbra to use, since at the last confrence port 25 was blocked by the network used by the conference network infrastructure people. I'm sure many can understand how important this issue is to me, right now!

    How much of this is thread relevant to Versions 5.0...? I've not yet found another other good search result, so I'm trying this OLD thrat.

    These tricks did not work on our Zimbra 5.x system. It does not look like Zimbra is using 7075 any longer and the iptables file listed does not exist:


    Starting Nmap 4.00 ( Nmap - Free Security Scanner For Network Exploration & Security Audits. ) at 2008-10-24 08:46 PDT
    Interesting ports on mail.mydomainobscured.com (0.0.0.0):
    (The 1663 ports scanned but not shown below are in state: closed)
    PORT STATE SERVICE
    22/tcp open ssh
    25/tcp open smtp
    111/tcp open rpcbind
    389/tcp open ldap
    443/tcp open https
    465/tcp open smtps
    623/tcp filtered unknown
    664/tcp filtered unknown
    796/tcp open unknown


    Need some help here to us another port besides 25!

  8. #8
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  9. #9
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    Default

    Thank you!

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