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> Hi, this is postfix logs: > > May 5 14:44:44 localhost postfix/smtpd[20350]: NOQUEUE: reject: RCPT > from 81-174-15-157.staticnet.ngi.it[81.174.15.157]: 554 5.7.1 Service > unavailable; Client host [81.174.15.157] blocked using > cbl.abuseat.org; from=<test> to=<pluto> proto=ESMTP > helo=<mail.domain.it> - show output of 'postconf -n' - how does this system (the one that rejects the client. that is, the one that generated the log above) perform DNS resolution? * do you run a DNS server (caching or whatever) or do you query one at an ISP or some other party (opendns for instance)? * if you run a DNS server, what server is this (BIND9, ...)? and does it forward requests to your ISP or some other party? ...
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