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Thread: Some emailers are being rejected

  1. #1
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    Default Some emailers are being rejected

    Need some help on this...

    On the admin page, global settings, MTA tab, I originally checked all the following:

    Protocol Checks:
    Hostname in greeting violates RFC
    Client must greet with a ...
    Sender address must ...

    DNS checks:
    Client's IP Address...
    Hostname in greeting...
    Sender's domain...

    One of my users is getting some of his emails bounced by Zimbra. These messages are not spam but I think they have to do with the security settings that I have chosen.

    The message that the originator gets back is:

    The e-mail system was unable to deliver the message, but did not
    report a specific reason. Check the address and try again. If it still
    fails, contact your system administrator.
    : Helo
    command rejected: Host not found>

    Am I correct in assuming the originator's system is very lax in security and they are not following industry standards? Is this just a situation where they have a lazy sys admin who doesn't really know what he/she is doing?

    What setting, in the Zimbra admin/global settings/MTA page do I have to undo so that this email can get through? I don't want to undo everything.

    Since using Zimbra and all the special checks from the MTA tab the amount of SPAM has been almost reduced to 0.

    Thanks in advance.

  2. #2
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    Default

    I'd guess either of these two:

    Hostname in greeting violates RFC
    Client must greet with a ...
    Looking for new beta users -> Co-Founder of Acompli. Previously worked at Zimbra (and Yahoo! & VMware) since 2005.

  3. #3
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    Default

    Once selecting or deselecting any of these options and then saving do they take effect immediately or do I have to restart zimbra?

  4. #4
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    Default

    You'll need to restart the MTA. We generate the config file at startup so a restart is needed.
    Looking for new beta users -> Co-Founder of Acompli. Previously worked at Zimbra (and Yahoo! & VMware) since 2005.

  5. #5
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    Default

    Quote Originally Posted by KevinH
    I'd guess either of these two:

    Hostname in greeting violates RFC
    Client must greet with a ...
    What is the default for the Zimbra system for both Protocol and DNS checks? I am running Zimbra 4.0 on CentOS 4.3. Thanks.

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