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Thread: Q: Configuration Change - "Client host rejected: cannot find your hostname"

  1. #1
    billinvegas's Avatar
    billinvegas is offline Active Member
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    Default Q: Configuration Change - "Client host rejected: cannot find your hostname"

    Hello,

    a potential customer has tried to e-mail us, and has been complaining that their e-mail is "bounced"..

    Here is a snippet of the logs showing the problem


    Aug 24 03:03:57 mail postfix/smtpd[17073]: NOQUEUE: reject: RCPT from unknown[72.52.99.152]: 450 4.7.1 Client host rejected: cannot find your
    hostname, [72.52.99.152]; from=<xxxx@mac.com> to=<xxxx@ourdomain.com> proto=ESMTP helo=<milan.hostgo.com>

    milan.hostgo.com has not been obfuscated, that is what's being sent as the helo


    I have the following enabled:

    Global Settings > MTA > Protocol Checks

    Hostname in greeting violateds RFC (reject_invalid_hostname)

    Client must greet with a fully qualified hostname (reject non_fqdn hostname)
    (this one would be the one to uncheck to allow mail in this situation - correct?)

    Sender address must be fully qualified (reject_non-fqdn_sender)

    Global Settings > MTA > DNS Checks

    Client's IP Address (reject_unknown_client)

    Hostname in greeting (reject unknown hostname)

    Sender's Domain (reject_unknown_sender_domain)

    Question:
    Is it possible to allow mail from this one mail server (milan.hostgo.com) or (hostgo.com) to bypass the protocol and dns checks?
    If so, how would I go about implementing this?

    Thank you very much

    Bill

    Release 7.1.1_GA_3196.RHEL5_64_20110527011124 CentOS5_64 FOSS edition.
    Release 7.1.1_GA_3196.RHEL5_64_20110527011124 CentOS5_64 FOSS edition

  2. #2
    phoenix is offline Zimbra Consultant & Moderator
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    Default

    There are many poorly configured mail servers and clients, you may want to consider whether it's worth using the protocol and DNS checks (I don't bother using them).
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

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