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Thread: Reverse DNS

  1. #1

    Default Reverse DNS

    Hey Guys,

    i'm having some trouble with my email.
    i figured out that at least 2 emails were not delivered to me this weekend.
    when i checked the log i found this:
    Code:
    Sep  7 11:46:28 SkynetServer postfix/smtpd[3929]: warning: 193.172.49.136: address not listed for hostname static.kpn.net
    
    Sep  7 11:46:28 SkynetServer postfix/smtpd[3929]: connect from unknown[193.172.49.136]
    Sep  7 11:46:29 SkynetServer postfix/smtpd[3929]: NOQUEUE: reject: RCPT from unknown[193.172.49.136]: 450 4.7.1 Client host rejected: cannot find your hostname, [193.172.49.136]; from=<GZomerdijk@deltion.nl> to=<email@arnoldnijboer.info> proto=ESMTP helo=<EXCH-02.ow.deltion.local>
    Sep  7 11:46:29 SkynetServer postfix/smtpd[3929]: disconnect from unknown[193.172.49.136]
    after some email contact with noc@kpn.net (netherland's biggest telecom provider) they where able to tell me it has something to do with the reverse dns lookup. (this case , and the other email were both from a .local domain send)

    buth how can i turn off the reverse dns lookup in postfix.
    or is there another way (appart from contacting the sender and let them configure there reverse dns)?!

    kind regard
    Arnold

  2. #2
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    Default Re: Reverse DNS

    Do the reverse of the advice in this posting, which was the first hit on "postfix reverse lookup":

    Reverse Lookup with Postfix - HowtoForge Forums | HowtoForge - Linux Howtos and Tutorials

  3. #3

    Default Re: Reverse DNS

    hmm thanks for the reply.

    sadly it doesn't solve my problem.

    i did:
    Code:
    sudo postconf -e 'disable_dns_lookups = yes'
    sudo /etc/inid.d/postfix restart
    after that i asked someone to mail me from one of those email adresses that didn't work. and it stil doesn't work.
    i also have a number of emails that are being retried so my logs are clogging up so to speak!

  4. #4
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    Default Re: Reverse DNS

    Do it this way:

    Add POSTFIX_ADD_DISABLE_DNS_LOOKUPS=yes to /etc/sysconfig/postfix.
    SuSEconfig --module postfix
    rcpostfix reload

  5. #5

    Default Re: Reverse DNS

    i've edited /etc/sysconfig/postfix with gedit.
    add doesn't work.
    suseconfig gives a unknown command.
    reload worked.

    end result.. still no email.

  6. #6
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    Default Re: Reverse DNS

    Wat bedoeel je met "add does not work"? de regel
    Code:
    POSTFIX_ADD_DISABLE_DNS_LOOKUPS=yes
    moet toegevoegd worden aan de file /etc/sysconfig/postfix.
    Dat kan toch geen probleem zijn? Als het met gedit niet werkt, gebruik dan een andere editor. Uiteraard moet je dit doen als root, is dat misschien het probleem?.
    Henk van Velden

  7. #7

    Default Re: Reverse DNS

    sudo Add POSTFIX_ADD_DISABLE_DNS_LOOKUPS=yes to /etc/sysconfig/postfix

    does not work.
    i've opend /etc/sysconfig/postfix with gedit and manualy inserted the line: POSTFIX_ADD_DISABLE_DNS_LOOKUPS=yes to the bottom of the file.

    duidelijker hcw?! ik had het idd niet goed verwoord.
    lag niet aan sudo, ik weet wel wanneer ik sudo moet gebruiken en wanneer juist niet

  8. #8
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    Default Re: Reverse DNS

    OK, einde misverstand. Maar nu even proberen onze engelstalige mede-openSUSE menen bij te praten.

    So, the line is in the file, but it does still not function as you want it?
    Henk van Velden

  9. #9

    Default Re: Reverse DNS

    indeed the line is inserted at the bottem of the postfic config file.
    the weird thing is that the line suseconfig -module postfix gives an error.
    i've tryed using just suseconfig withoud prefix. and even that gives a unknown command.
    suseconfig is like a kernel program right. it's a standard package, or do i need to install it sepparate?

    and no (or yes if you please) the mail send to me by those 2 domains is still not delivered in my mail box.

    kind regard
    Arnold

  10. #10
    Join Date
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    Default Re: Reverse DNS

    Hello Arnold,

    it is SuSEconfig not suseconfig, so:
    Code:
    SuSEconfig --module postfix
    rcpostfix reload
    Upercase/lowercase is significant in Unix/Linux.
    Henk van Velden

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