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Thread: What ports should be open

  1. #1
    glennbtn is offline Loyal Member
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    Default What ports should be open

    Hi

    We have installed Zimbra on a public hosted server. We can send and receive most mail. Some companies that we need to send email to use places like mimecast.com. When we send email to these it just sits in the box, if we disable the firewall (apf on centos) the mail goes out.

    Can anyone make a suggestion as to why this is when mail that usually goes to a company mail server direct has no issues.

    Many thanks

  2. #2
    phoenix is offline Zimbra Consultant & Moderator
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    The only outbound port required to send email is Port 25 the SMTP port.

    Ports - Zimbra :: Wiki
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  3. #3
    glennbtn is offline Loyal Member
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    Thanks for that. Not sure why these server only accept mail when the firewall is off even though 25 etc is open

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    phoenix is offline Zimbra Consultant & Moderator
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    It's not recommended that you run a firewall on the Zimbra server although you should protect it with one, perhaps you should investigate your IPTABLES rules and see if it's blocking anything outbound. There's also this in the wiki: Firewall Configuration - Zimbra :: Wiki
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  5. #5
    SpiderTech is offline Special Member
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    Another port for SMTP is 587. I notice some SMTP servers block 25 for spam reasons.

  6. #6
    phoenix is offline Zimbra Consultant & Moderator
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    Quote Originally Posted by SpiderTech View Post
    Another port for SMTP is 587. I notice some SMTP servers block 25 for spam reasons.
    Port 587 is the Submission port, that is the correct port for mail clients to submit mail for delivery. It's not the SMTP port, that is port 25 and is used by mail server to connect to each other. Port 587 can be used if a mail forwarding service is sending mail to a server because port 25 is blocked by an ISP.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

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