Hi there friends and colleagues, Maybe someone here can help. We have a lot of genius mailadmin know-how here š
On one of our mailservers we use postfix with dnsblog on localhost:53 to resolve connecting IP addresses against RBLs etc. However from time to time we get a large bunch of blackouts. It works 90% of the time but now and then its spamming the maillog with timeouts or āunable to resolveā messages. I am a bit clueless. Local nameresolution works flawlessly. The /etc/resolv.conf looks like this: nameserver 127.0.0.53 options edns0 trust-ad netstat -tulpn |grep 53 tcp 0 0 127.0.0.53:53 0.0.0.0:* LISTEN 586/systemd-resolve udp 0 0 127.0.0.53:53 0.0.0.0:* 586/systemd-resolve Errors in /var/log/mail.log Dec 3 11:59:21 mta01 postfix/postscreen[194346]: CONNECT from [196.189.63.96]:62377 to [217.172.165.13]:25 Dec 3 11:59:21 mta01 postfix/dnsblog[194354]: addr 196.189.63.96 listed by domain spam.dnsbl.anonmails.de as 127.0.0.2 Dec 3 11:59:21 mta01 postfix/dnsblog[194355]: addr 196.189.63.96 listed by domain dnsbl-2.uceprotect.net as 127.0.0.2 Dec 3 11:59:21 mta01 postfix/dnsblog[194364]: addr 196.189.63.96 listed by domain dnsbl-1.uceprotect.net as 127.0.0.2 Dec 3 11:59:21 mta01 postfix/dnsblog[194380]: addr 196.189.63.96 listed by domain zen.spamhaus.org as 127.255.255.254 Dec 3 11:59:21 mta01 postfix/dnsblog[194382]: addr 196.189.63.96 listed by domain cbl.abuseat.org as 127.0.0.2 Dec 3 11:59:21 mta01 postfix/dnsblog[194360]: addr 196.189.63.96 listed by domain truncate.gbudb.net as 127.0.0.2 Dec 3 11:59:21 mta01 postfix/dnsblog[194363]: addr 196.189.63.96 listed by domain hostkarma.junkemailfilter.com as 127.0.1.2 Dec 3 11:59:21 mta01 postfix/dnsblog[194363]: addr 196.189.63.96 listed by domain hostkarma.junkemailfilter.com as 127.0.0.2 Dec 3 11:59:22 mta01 postfix/dnsblog[194381]: addr 196.189.63.96 listed by domain all.s5h.net as 127.0.0.2 Dec 3 11:59:22 mta01 postfix/dnsblog[194350]: addr 196.189.63.96 listed by domain dnsbl.spfbl.net as 127.0.0.4 Dec 3 11:59:22 mta01 postfix/dnsblog[194354]: addr 196.189.63.96 listed by domain ix.dnsbl.manitu.net as 127.0.0.2 Dec 3 11:59:22 mta01 postfix/dnsblog[194384]: addr 196.189.63.96 listed by domain sbl-xbl.spamhaus.org as 127.255.255.254 Dec 3 11:59:22 mta01 postfix/dnsblog[194356]: addr 196.189.63.96 listed by domain b.barracudacentral.org as 127.0.0.2 Dec 3 11:59:25 mta01 postfix/dnsblog[194365]: addr 196.189.63.96 listed by domain db.wpbl.info as 127.0.0.2 Dec 3 11:59:26 mta01 postfix/dnsblog[194371]: warning: dnsblog_query: lookup error for DNS query 96.63.189.196.list.dnswl.org: Host or domain name not found. Name service error for name=96.63.189.196.list.dnswl.org type=A: Host not found, try again Dec 3 11:59:27 mta01 postfix/postscreen[194346]: DNSBL rank 34 for [196.189.63.96]:62377 Dec 3 11:59:27 mta01 postfix/postscreen[194346]: NOQUEUE: reject: RCPT from [196.189.63.96]:62377: 550 5.7.1 Service unavailable; client [196.189.63.96] blocked using b.barracudacentral.org; from=<x...@xxx.xx>, to=<y...@yyy.yy>, proto=ESMTP, helo=<[196.189.63.96]> Dec 3 11:59:27 mta01 postfix/postscreen[194346]: HANGUP after 0.69 from [196.189.63.96]:62377 in tests after SMTP handshake Dec 3 11:59:27 mta01 postfix/postscreen[194346]: DISCONNECT [196.189.63.96]:62377 Dec 3 11:59:31 mta01 postfix/dnsblog[194348]: warning: dnsblog_query: lookup error for DNS query 96.63.189.196.access.redhawk.org: Host or domain name not found. Name service error for name=96.63.189.196.access.redhawk.org type=A: Host not found, try again Dec 3 11:59:31 mta01 postfix/postscreen[194346]: warning: dnsblog reply timeout 10s for access.redhawk.org Dec 3 11:59:31 mta01 postfix/postscreen[194346]: warning: dnsblog reply timeout 10s for dnsbl.zapbl.net Dec 3 11:59:31 mta01 postfix/postscreen[194346]: warning: dnsblog reply timeout 10s for spam.spamrats.com Dec 3 11:59:31 mta01 postfix/postscreen[194346]: warning: dnsblog reply timeout 10s for aspews.ext.sorbs.net Dec 3 11:59:31 mta01 postfix/postscreen[194346]: warning: dnsblog reply timeout 10s for dul.abusecheck.org Dec 3 11:59:31 mta01 postfix/postscreen[194346]: warning: dnsblog reply timeout 10s for bl.spamcop.net Dec 3 11:59:31 mta01 postfix/postscreen[194346]: warning: dnsblog reply timeout 10s for bl.fmb.la Dec 3 11:59:31 mta01 postfix/postscreen[194346]: warning: dnsblog reply timeout 10s for bl.suomispam.net Dec 3 11:59:31 mta01 postfix/postscreen[194346]: warning: dnsblog reply timeout 10s for noptr.spamrats.com Dec 3 11:59:31 mta01 postfix/postscreen[194346]: warning: dnsblog reply timeout 10s for multi.surbl.org Dec 3 11:59:31 mta01 postfix/postscreen[194346]: warning: dnsblog reply timeout 10s for black.junkemailfilter.com Dec 3 11:59:31 mta01 postfix/dnsblog[194352]: warning: dnsblog_query: lookup error for DNS query 96.63.189.196.dnsbl.zapbl.net: Host or domain name not found. Name service error for name=96.63.189.196.dnsbl.zapbl.net type=A: Host not found, try again Dec 3 11:59:31 mta01 postfix/dnsblog[194359]: warning: dnsblog_query: lookup error for DNS query 96.63.189.196.spam.spamrats.com: Host or domain name not found. Name service error for name=96.63.189.196.spam.spamrats.com type=A: Host not found, try again Dec 3 11:59:31 mta01 postfix/dnsblog[194367]: warning: dnsblog_query: lookup error for DNS query 96.63.189.196.aspews.ext.sorbs.net: Host or domain name not found. Name service error for name=96.63.189.196.aspews.ext.sorbs.net type=A: Host not found, try again Dec 3 11:59:31 mta01 postfix/dnsblog[194370]: warning: dnsblog_query: lookup error for DNS query 96.63.189.196.dul.abusecheck.org: Host or domain name not found. Name service error for name=96.63.189.196.dul.abusecheck.org type=A: Host not found, try again Dec 3 11:59:31 mta01 postfix/dnsblog[194374]: warning: dnsblog_query: lookup error for DNS query 96.63.189.196.bl.spamcop.net: Host or domain name not found. Name service error for name=96.63.189.196.bl.spamcop.net type=A: Host not found, try again Dec 3 11:59:31 mta01 postfix/dnsblog[194378]: warning: dnsblog_query: lookup error for DNS query 96.63.189.196.bl.fmb.la: Host or domain name not found. Name service error for name=96.63.189.196.bl.fmb.la type=A: Host not found, try again Dec 3 11:59:31 mta01 postfix/dnsblog[194372]: warning: dnsblog_query: lookup error for DNS query 96.63.189.196.bl.suomispam.net: Host or domain name not found. Name service error for name=96.63.189.196.bl.suomispam.net type=A: Host not found, try again Dec 3 11:59:31 mta01 postfix/dnsblog[194369]: warning: dnsblog_query: lookup error for DNS query 96.63.189.196.noptr.spamrats.com: Host or domain name not found. Name service error for name=96.63.189.196.noptr.spamrats.com type=A: Host not found, try again Dec 3 11:59:31 mta01 postfix/dnsblog[194383]: warning: dnsblog_query: lookup error for DNS query 96.63.189.196.black.junkemailfilter.com: Host or domain name not found. Name service error for name=96.63.189.196.black.junkemailfilter.com type=A: Host not found, try again Dec 3 11:59:31 mta01 postfix/dnsblog[194347]: warning: dnsblog_query: lookup error for DNS query 96.63.189.196.multi.surbl.org: Host or domain name not found. Name service error for name=96.63.189.196.multi.surbl.org type=A: Host not found, try again When I try to lookup for example: nslookup 96.63.189.196.spam.spamrats.com Server: 127.0.0.53 Address: 127.0.0.53#53 Non-authoritative answer: Name: 96.63.189.196.spam.spamrats.com Address: 127.0.0.38 It also seems to work ā however the dnsblog_query above compains that it cannot resolve that. I am a bit out of ideas. KR Daniel
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