Support contact for AS7643 - VNpt network, which has an unsatisfactory reputation. See:
https://bgp.he.net/AS7643#_whois (AS7643 - Vietnam Posts and Telecommunications (VNPT) is supported by VNpt.vn domain / VNPT Corp)
http://bgp.he.net/AS7643#_whois (AS7643 - VNPT network, supported by VNpt and vnnic.net.vn)
www.mywot.com/en/scorecard/vnnic.net.vn (the unsatisfactory reputation of vnnic.net / vdc.com.vn, which supports AS7643 - Vietnam Posts and Telecommunications--VNPT--along with VNpt.vn / VNpt network / VNpt Corp, spam operations)
https://bgp.he.net/dns/VNpt.vn#_ipinfo (VNpt.vn is run by AS45899 - VNPT Corp / AS7643 - VNPT (Vietnam Posts and Telecommunications)
Spam message with suspicious attachment: "Delivery Confirmation Receipt - Tracking #3DF11004B". From the header: <heakeHector9074@giantstheatre.com>([188.8.131.52]). "Your parcel has been delivered at 3:24 PM. Please, find the confirmation below." Tired of seeing spam coming through this firm into employee inboxes. The domain listed in the header has been around since 2009, updated last September, spoofed apparently. I'll bet my boots that who's calling the shots is attached to www.vnpt.vn.