Easiest Way To Fix Postfix Rbl Search Error

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    This is definitely abnormal behavior, it looks like Postfix is ​​unable to access certain blacklisted servers.

    On your computer, try the following command:( nslookup is still frequently installed, or may be installed with dnsutils or a similar package.)

      nslookup 127.0.0.2.zen.spamhaus.org 
    
      Optional answer:Name: 127 .0.0.2.zen.spamhaus.orgAddress: 127.0.0.11 
    

    If the command phrase has expired, the blacklisted DNS server between your server is unavailable. If so, check if other DNS lookups are working as expected (for example, nslookup unix.stackexchange.com ).

    I suspect that some software is blocking access to this DNS hosting space, or that your server is connected to send too many requests. The latter seems unlikely given the accurate timestamps from afar in your journal. However, all of your requests can be sent through the DNS server of your main ISP. This device may reach the limit set by theBlacklisted customers and thus be blocked.

    You can first verify this by contacting the spam server directly:

      nslookup 127.0.0.2.zen.spamhaus.org a.ns.spamhaus.org 
    

    If this succeeds, but the default search for your service fails, it means that your resolver is blocked by Spamhaus by default. Be sure to install a full fledged caching DNS server.

    Instead, I find the following types of messages in the Postfix log:

    postfix rbl lookup error

      17:40:55 smtpd: warning: 34.77.82.185.b.barracudacentral.org: rbl lookup failed: hostname or domain name not found. Name service error name = 34 for.77.82.185.b.barracudacentral.org type = A: host not found, please try again17:41:05 Warning: smtpd: 34.77.82.185.hostkarma.junkemailfilter.com: RBL lookup failed: Host domain alias not found. Error name name = 34 for.77.82.185.hostkarma.junkemailfilter.com type = A: Host not found, please try again18:15:02 smtpd: Warning: ptmail1.patrontechnology.com.dbl.spamhaus.org: Search failed rbl: Hostname or website not found. Naming system error for name = ptmail1.patrontechnology.com.dbl.spamhaus.org type = A: host not recognized, please try again18:40:27 smtpd: warning: 177.141.213.134.zen.spamhaus.org: errorsSearch name rbl: host or domain expression not found. Name-to-name service only error = 177.141.213.134.zen.spamhaus.org type = A: host not found, please try again 
    

    I am trying to figure out if there is something wrong with my setup, or if these messages (as I have not read anywhere else) are just a little weird, with the note that the sender is absolutely not blacklisted by the specified service. Of course, some (probably all) of the emails that generate these messages are clean and will actually route correctly with successful Postfix.

      rejection_rbl_client zen.spamhaus.orgreject_rbl_client b.barracudacentral.orgrejection_rbl_client hostkarma.junkemailfilter.com = 127.0.0.2reject_rhsbl_helo dbl.spamhaus.orgreject_rhsbl_sender dbl.spamhaus.orgreject_rhsbl_reverse_client dbl.spamhaus.org 
    

    Circus78

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