your IP (88.212.196.82) is on one blacklist here. http://whatismyipaddress.com/blacklist-check

Oooops 88.212.196.82 is currently listed in APEWS :-( Entry matching your Query: E-173048 88.212.196.0/24 CASE: C-82 IP space of "hot" UCE/UBE operations per NANAS, NANAE, UCEtraps & published statistics [b]Special Reason: per NANAS, NANAE, UCEtraps, MTA headers continued abuse / abuse volume = escalation ultimately, all your ASN[s] will be listed[/b] History: Entry created 2007-05-18

urlquery. http://urlquery.net/report.php?id=8419448
alert by Suricata filter as

Suricata /w Emerging Threats Pro Timestamp Source IP Destination IP Severity Alert 2013-12-17 11:56:07 91.202.63.125 urlQuery Client 3 ET RBN Known Russian Business Network IP group 420 2013-12-17 11:56:07 88.212.196.87 urlQuery Client 3 ET RBN Known Russian Business Network IP group 397

russian business network info. http://en.wikipedia.org/wiki/Russian_Business_Network