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Thread: Client host rejected: cannot find your hostname,

  1. #1
    ScottChapman is offline Special Member
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    Default Client host rejected: cannot find your hostname,

    So, I am getting this for some email coming in. But I want to allow it. Here is the log:
    Nov 23 21:00:47 zimbra postfix/smtpd[15582]: NOQUEUE: reject: RCPT from unknown[208.43.206.59]: 450 4.7.1 Client host rejected: cannot find your hostname, [208.43.206.59]; from=<santa@elfster.com> to=<andra@woofplanet.com> proto=ESMTP helo=<web02.elfster.com>

    My postfix_recipient_restrictions.cf file looks like this:
    reject_non_fqdn_recipient
    permit_sasl_authenticated
    permit_mynetworks
    reject_unauth_destination
    reject_unlisted_recipient
    %%contains VAR:zimbraMtaRestriction reject_invalid_hostname%%
    %%contains VAR:zimbraMtaRestriction reject_non_fqdn_hostname%%
    %%contains VAR:zimbraMtaRestriction reject_non_fqdn_sender%%
    %%contains VAR:zimbraMtaRestriction reject_unknown_client%%
    %%contains VAR:zimbraMtaRestriction reject_unknown_hostname%%
    %%contains VAR:zimbraMtaRestriction reject_unknown_sender_domain%%
    %%explode reject_rbl_client VAR:zimbraMtaRestrictionRBLs%%
    permit

  2. #2
    Bill Brock is offline Outstanding Member
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    Default Global settings DNS Check.

    This is in the GUI. The rejected mail server probably has no reverse DNS. This in effect makes them NOT RFC compliant. In other words, they are not configured properly. But anyway, turning off the DNS checking features will probably let them through.

  3. #3
    ScottChapman is offline Special Member
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    Default

    I have "enable DNS lookups" turned off in my servers MTA setting.

  4. #4
    Bill Brock is offline Outstanding Member
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    Default That is in Server Settings. Try Global.

    Go to global settings where there are three DNS settings and three protocol settings.

  5. #5
    ScottChapman is offline Special Member
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    Default

    WOuldn't the server setting override the global setting?

  6. #6
    Bill Brock is offline Outstanding Member
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    Default I think it should.

    I think it should override but it doesn't appear to be. Have you tried the global settings just to verify what settings are causing the rejection?

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