Don't know whether it's related, but check out this post, regarding DNSSEC (if you are also running this)
my log says:
Jan 30 14:50:54 dnsmasq[620]: query[A] www.postbank.de from 192.168.2.125
Jan 30 14:50:54 dnsmasq[620]: forwarded www.postbank.de to 127.10.10.1
Jan 30 14:50:55 dnsmasq[620]: query[A] www.postbank.de from 192.168.2.125
Jan 30 14:50:55 dnsmasq[620]: forwarded www.postbank.de to 127.10.10.2
Jan 30 14:50:55 dnsmasq[620]: forwarded www.postbank.de to 127.10.10.1
Jan 30 14:50:56 dnsmasq[620]: query[A] www.postbank.de from 192.168.2.125
Jan 30 14:50:56 dnsmasq[620]: forwarded www.postbank.de to 127.10.10.2
Jan 30 14:50:56 dnsmasq[620]: forwarded www.postbank.de to 127.10.10.1
Jan 30 14:50:58 dnsmasq[620]: query[A] www.postbank.de from 192.168.2.125
Jan 30 14:50:58 dnsmasq[620]: forwarded www.postbank.de to 127.10.10.2
Jan 30 14:50:58 dnsmasq[620]: forwarded www.postbank.de to 127.10.10.1
Jan 30 14:51:02 dnsmasq[620]: query[A] www.postbank.de from 192.168.2.125
Jan 30 14:51:02 dnsmasq[620]: forwarded www.postbank.de to 127.10.10.2
Jan 30 14:51:02 dnsmasq[620]: forwarded www.postbank.de to 127.10.10.1
Jan 30 14:51:02 dnsmasq[620]: validation www.postbank.dE is BOGUS
Jan 30 14:51:02 dnsmasq[620]: query[A] www.postbank.de from 192.168.2.125
Jan 30 14:51:02 dnsmasq[620]: forwarded www.postbank.de to 127.10.10.2
Jan 30 14:51:02 dnsmasq[620]: validation www.postbank.dE is BOGUS
Jan 30 14:51:08 dnsmasq[620]: query[A] www.postbank.de from 192.168.2.125
Jan 30 14:51:08 dnsmasq[620]: forwarded www.postbank.de to 127.10.10.2
Jan 30 14:51:08 dnsmasq[620]: validation www.postbank.dE is BOGUS
Jan 30 14:51:08 dnsmasq[620]: query[A] www.postbank.de from 192.168.2.125
Jan 30 14:51:08 dnsmasq[620]: forwarded www.postbank.de to 127.10.10.2
Jan 30 14:51:08 dnsmasq[620]: validation www.postbank.dE is BOGUS
I'm already running the correct dnsmasq version, so there appears to be something wrong with this domain.