AS4837 is running spam operations, sustaining IP addresses rated up to "critical" for the amounts of spam sent during a 30 day period. Maintaining CBL-listed, botnet-infected IP addresses during a 30 day period.
www.senderbase.org/lookup/org/?search_string=China%20Unicom%20IP%20network (critical amounts of spam from the ChinaUnicom / chinaUnicom.cn network, which Tinet routes)
tinet / gtt.net is peer routing for the AS4837 / Unicom-Fujian network:
http://bgp.he.net/AS4837
www.mywot.com/en/scorecard/ChinaUnicom.cn (the poor reputation of China Unicom / chinaUnicom.cn, which tinet is routing)
whois: Shows as3257.net is owned by tinet
https://candi.gtt.net/billing/index.php ("Tinet International Network"; gtt.net is also a support domain name for Tinet)
AND
http://bgp.he.net/AS25973#_whois (AS25974 – packetexchange / GTT Communications, Inc / gtt.net relationship; which is routed by Tinet)
www.mywot.com/scorecard/packetexchange.net (the unsatisfactory reputation of packetExchange.net, run by GTT Comm / gtt.net)
OTHER:
www.senderbase.org/lookup/org/?search_string=Tinet%20SpA (rather spam, botnet clean Tinet network)