A quick Google search reveals this:
http://mailman.powerdns.com/pipermail/pdns-users/2006-August/003710.html
From: Sam Scafe [mailto:samanthaHIDDEN@blackdog.com.au]
Sent: Saturday, March 24, 2012 6:37 AM
To: surgemail-list@netwinsite.com
Subject: [SurgeMail List] Using PDNS and SURGEMAIL
Guys
Changed over from bind9 to pdns
However I am getting this in the log files of pdns
Has anyone got any advice
Mar 24 20:26:13 ns3 pdns[1753]: Received a malformed qdomain from 203.26.xxx.xxx, '::ffff:182.183.214.111.bl.spamcop.net': sending servfail
Mar 24 20:26:13 ns3 pdns[1753]: Received a malformed qdomain from 203.26.xxx.xxx, '::ffff:182.183.214.111.dnsbl.sorbs.net': sending servfail
Mar 24 20:26:13 ns3 pdns[1753]: Received a malformed qdomain from 203.26.xxx.xxx, '::ffff:182..183.214.111.list.dnswl.org': sending servfail
Mar 24 20:26:13 ns3 pdns[1753]: Received a malformed qdomain from 203.26.xxx.xxx, '::ffff:182.183.214.111.sbl-xbl.spamhaus.org': sending servfail
Mar 24 20:26:13 ns3 pdns[1753]: Received a malformed qdomain from 203.26.xxx.xxx, '::ffff:182.183.214.111.spam.dnsrbl.net': sending servfail
Mar 24 20:26:13 ns3 pdns[1753]: Received a malformed qdomain from 203.26.xxx.xxx, '::ffff:182.183.214.111.combined.njabl.org': sending servfail
Mar 24 20:26:13 ns3 pdns[1753]: Received a malformed qdomain from 203.26.xxx.xxx, '198.72.174.::ffff:212.in-addr.arpa': sending servfail
Mar 24 20:26:17 ns3 pdns[1753]: Received a malformed qdomain from 203.26.xxx.xxx, '111.214.183.::ffff:182.in-addr.arpa': sending servfail
Kind Regards
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Samantha Scafe
System Administrator
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