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SMTP<< 450 4.7.1 Client host rejected: cannot find your reverse hostname.

Discussion in 'E-mail Discussions' started by andy75180, Aug 30, 2009.

  1. andy75180

    andy75180 Registered

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    Hi ya,

    I have this really annoying problem with my Exim server.

    99% of my emails get delivered correctly, but sometimes I get a bounce back with the error: SMTP<< 450 4.7.1 Client host rejected: cannot find your reverse hostname

    All my reverse rDNS entries are correct and resolve to my hostname correctly. So I don't understand why this happens now and again.

    Any help anybody?

    Andy
     
  2. thewebhosting

    thewebhosting Well-Known Member

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    Kindly provide us the mail logs for the bounce back mail which you are receiving. You can check the mail logs from the below location:

    /var/log/exim_mainlog
     
  3. andy75180

    andy75180 Registered

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    2009-08-30 22:51:04 cwd=/usr/local/cpanel/whostmgr/docroot 2 args: /usr/sbin/exim -bpc
    2009-08-30 22:51:04 cwd=/usr/local/cpanel/whostmgr/docroot 2 args: /usr/sbin/exim -bp
    2009-08-30 22:51:06 cwd=/usr/local/cpanel/whostmgr/docroot 3 args: /usr/sbin/exim -Mt 1MhpPJ-0004k8-W9
    2009-08-30 22:51:06 cwd=/usr/local/cpanel/whostmgr/docroot 4 args: /usr/sbin/exim -v -M 1MhpPJ-0004k8-W9
    2009-08-30 22:51:08 1MhpPJ-0004k8-W9 SMTP error from remote mail server after RCPT TO:<xxxxx@xxxxx>: host emdch-mx11.nt.gov.au [203.26.75.14]: 450 4.7.1 Client host rejected: cannot find your reverse hostname, [115.124.105.87]
    2009-08-30 22:51:10 1MhpPJ-0004k8-W9 == xxxxx@xxxxx R=dk_lookuphost T=dk_remote_smtp defer (-44): SMTP error from remote mail server after RCPT TO:<xxxxx@xxxxx>: host emdch-mx21.nt.gov.au [203.26.75.16]: 450 4.7.1 Client host rejected: cannot find your reverse hostname, [115.124.105.87]
    2009-08-30 22:51:13 cwd=/usr/local/cpanel/whostmgr/docroot 2 args: /usr/sbin/exim -bpc
    2009-08-30 22:51:13 cwd=/usr/local/cpanel/whostmgr/docroot 2 args: /usr/sbin/exim -bp
    2009-08-30 22:51:27 cwd=/etc/csf 2 args: /usr/sbin/exim -bpc
     
  4. thewebhosting

    thewebhosting Well-Known Member

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    Make sure that you have setup PTR record for your server, since some mail service provider requires it to send/receive emails.
     

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