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Thread: I added my ISP as my outgoing relay for port 25 but authentication issue..

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  1. #1
    Join Date
    Apr 2009
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    Default I added my ISP as my outgoing relay for port 25 but authentication issue..

    Our ISP is blocking port 25 so we are sending mail out using relay. Where do we set up authentication? I am under the "servers "tab in "MTA" under "network." Is this the right place to set it? If so, how do we set up? There is no section for authentication or to put in an email address to authenticate..

    host[] said: 550 5.7.1
    Authentication Required (in reply to MAIL FROM command)

    ANY help is appreciated! Not sure what I am doing!

    Ubuntu 8.04 with Zimbra 6.06 Thanks.
    Ubuntu 8.0.4 /Zimbra Open Source 6.06

  2. #2
    phoenix is offline Zimbra Consultant & Moderator
    Join Date
    Sep 2005
    Vannes, France
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    This has been covered in the forums many times, go to the wiki and search for the word 'authentication'.


    Acompli: A new adventure for Co-Founder KevinH.

  3. #3
    Join Date
    Apr 2009
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    Ok, I looked at that and appears it sends me to this solution: Outgoing SMTP Authentication - Zimbra :: Wiki

    Our ISP says just send mail out on port 587 as they dont block that.

    "Some ISP's SMTP servers do not implement TLS properly on port 465 (AT&T Yahoo DSL in particular); mail clients handle this when making an SSL connection, however Postfix loses the server connection in this case. Port 587, the standard secondary SSL SMTP port, does work properly with TLS.

    The proper commands for AT&T DSL customers in the above setup are:


    zmprov ms zimbraMtaRelayHost


    zmprov ms zimbraMtaRelayHost

    And add:

    postconf -e smtp_sasl_mechanism_filter=plain,login
    postconf -e smtp_sasl_security_options=noanonymous
    postconf -e smtp_tls_security_level=may
    " of course adding MY ISP ? Thanks.

    The problem is that I am getting: relay =, delay482 status=deferred (SASL authentication failed; (Not Authorized to login as specified user)
    Last edited by Linuxwho; 10-27-2010 at 01:34 PM.
    Ubuntu 8.0.4 /Zimbra Open Source 6.06

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