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Thread: SMTP-Submit & Zimbra

  1. #1
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    Default SMTP-Submit & Zimbra

    Lately I've found myself in places where SMTP outbound traffic is blocked to my access. I spend some quality time on public internet access (think coffeeshop) and I'm wondering if there's a way that Zimbra can accept SMTP-Submit traffic on a non-25 port (I think standard for EIMS and the like is 587?).

    Has anyone modded Zimbra's OS Edition to do this?

  2. #2
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    You could add a rule to iptables to map a non-25 port to 25 for this purpose.
    Looking for new beta users -> Co-Founder of Acompli. Previously worked at Zimbra (and Yahoo! & VMware) since 2005.

  3. #3
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    courtesy of marcmac:
    ------------------------
    On the mta server, as root:
    edit /opt/zimbra/postfix/conf/master.cf

    Look for this line near the top:
    smtp inet n - n - - smtpd

    Immediately below that, add the line
    26 inet n - n - - smtpd

    Once that's done:
    su - zimbra
    postfix reload

    You'll need that on every MTA, and this will NOT persist across upgrades (you'll need to repeat this procedure).
    ------------------------

  4. #4
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    Where 26 is the new and different portnumber?

    Quote Originally Posted by bobby
    courtesy of marcmac:
    ------------------------
    On the mta server, as root:
    edit /opt/zimbra/postfix/conf/master.cf

    Look for this line near the top:
    smtp inet n - n - - smtpd

    Immediately below that, add the line
    26 inet n - n - - smtpd

    Once that's done:
    su - zimbra
    postfix reload

    You'll need that on every MTA, and this will NOT persist across upgrades (you'll need to repeat this procedure).
    ------------------------

  5. #5
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    exactly. should have mentioned that

  6. #6
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    Now, the $64,000 question...

    Can I use the new 587 port as a mail relay for other domains?

  7. #7
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    That should work if you configure those domains to transport to some other mta.

    More info on that here:

    http://wiki.zimbra.com/index.php?title=ManagingDomains
    Looking for new beta users -> Co-Founder of Acompli. Previously worked at Zimbra (and Yahoo! & VMware) since 2005.

  8. #8
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    Ah, I misspoke.

    Another mailserver I am familiar with, EIMS, when SMTP-Submit is enabled, so long as you authenticate to EIMS as a user on the server, you may send mail from any domain through EIMS. This does not seem to be the case with Zimbra, and I'm assuming that's intentional...

    Is there a way around that?

  9. #9
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    Quote Originally Posted by tbridge
    Is there a way around that?

    Not sure off hand other than listing all the domains. I think you should be able to config Postfix to allow you to fully relay mail for all auth'd users.
    Looking for new beta users -> Co-Founder of Acompli. Previously worked at Zimbra (and Yahoo! & VMware) since 2005.

  10. #10
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    Quote Originally Posted by bobby View Post
    courtesy of marcmac:
    ------------------------
    On the mta server, as root:
    edit /opt/zimbra/postfix/conf/master.cf

    Look for this line near the top:
    smtp inet n - n - - smtpd

    Immediately below that, add the line
    26 inet n - n - - smtpd

    Once that's done:
    su - zimbra
    postfix reload

    You'll need that on every MTA, and this will NOT persist across upgrades (you'll need to repeat this procedure).
    ------------------------
    What does the line starting with 26 do?

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