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Thread: External STMP Relay

  1. #21
    phoenix is offline Zimbra Consultant & Moderator
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    Quote Originally Posted by andremta View Post
    Yes, the issue is the outbound (seems my ISP does not support relay through my port 25).
    You need to find out from your ISP if they allow outbound relaying through their mail servers.

    Quote Originally Posted by andremta View Post
    What is the solution? Instead of using 25 as my local MTA port use the 26 and make an iptables rule to forward all data from my zimbra.server.com:25 to zimbra.server.com:26 ?

    Do you think this will make a difference?
    No, because what you're describing here is an inbound connection. What was the answer to my earlier question about using the DynDNS service?
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  2. #22
    uxbod's Avatar
    uxbod is offline Moderator
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    Well, I guess by using IP Tables Bill the source port for outgoing connections will be 26 instead of 25. Though the question stands has the OP spoken to the ISP and confirm the situation

  3. #23
    phoenix is offline Zimbra Consultant & Moderator
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    Except for the fact you've already said how he should change the outbound relay port, using IPtables won't make any difference - unless I'm asking the usual dumb questions.

    Anyway, if mail can be sent via Thunderbird using port 25 then it should work for a mail server using port 25, yes? The only problem is if the ISP requires the use of one of the submission ports such as 587 rather than 25.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  4. #24
    uxbod's Avatar
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    Indeed, and that can be sorted by modifying the zmprov command.

  5. #25
    veronica is offline Outstanding Member
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    > If I configure the Thunderbird to use directly my ISP SMTP (with no authentication nor security) it works!

    > But... When I configure in Zimbra admin to relay at the same SMTP is does not!

    Somehow i am not convinced that your ISP allows you to relay the mails, but if i trust you and they do, is it IP based relaying they did? Is it that your server IP is in different IP than what your ISP assigns ?

  6. #26
    andremta is offline Special Member
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    Quote Originally Posted by uxbod View Post
    Gotcha, have you asked your ISP out of interest ?
    I was reading the Outgoing SMTP Authentication

    I'm having problems, how can I disable the command through command line?

    zmprov ms server.domain.com zimbraMtaRelayHost external.relay.com:#

    Web Gui does not allow me to change that value.

  7. #27
    andremta is offline Special Member
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    Quote Originally Posted by andremta View Post
    I was reading the Outgoing SMTP Authentication

    I'm having problems, how can I disable the command through command line?


    Web Gui does not allow me to change that value.
    I think the problem was that... I had to change the "MTA Trusted Networks" from 192.168.0.0/16 to 192.168.1.0/24

  8. #28
    veronica is offline Outstanding Member
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    Good it works now :-)

  9. #29
    andremta is offline Special Member
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    Quote Originally Posted by veronica View Post
    Good it works now :-)
    Well... not yet! The connection to my ISP SMTP is being refused... I think authentication is not working correctly yet.

  10. #30
    andremta is offline Special Member
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    Damn it!

    I'm having the followed message:

    SASL authentication failed; cannot authenticate to server smtp.myisp.net[213.xxx.xx.xx]: generic failure

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