Lanset America Corporation. Home of the brave spammers that use multiple source IP addresses to avoid RBLs to send out spam messages. No, not just one piece a day, but rather so heavily like no one else. Of course with domainkeys and link to report abuse. Thank you Lanset, go to hell.
Stats of half a day of firewall logs on how many connection trials are coming from their network:
57270 3436K DROP tcp — * * 63.81.80.0/20 0.0.0.0/0 tcp dpt:25
0 0 DROP tcp — * * 70.98.78.0/23 0.0.0.0/0 tcp dpt:25
710 42600 DROP tcp — * * 70.102.102.0/23 0.0.0.0/0 tcp dpt:25
31452 1887K DROP tcp — * * 63.83.72.0/21 0.0.0.0/0 tcp dpt:25
0 0 DROP tcp — * * 63.82.48.0/21 0.0.0.0/0 tcp dpt:25
11507 690K DROP tcp — * * 63.80.88.0/23 0.0.0.0/0 tcp dpt:25
47722 2863K DROP tcp — * * 63.80.184.0/21 0.0.0.0/0 tcp dpt:25
0 0 DROP tcp — * * 209.210.24.0/23 0.0.0.0/0 tcp dpt:25
0 0 DROP tcp — * * 208.187.244.0/23 0.0.0.0/0 tcp dpt:25
0 0 DROP tcp — * * 208.187.160.0/21 0.0.0.0/0 tcp dpt:25
0 0 DROP tcp — * * 208.186.112.0/23 0.0.0.0/0 tcp dpt:25
121K 7278K DROP tcp — * * 69.94.128.0/19 0.0.0.0/0 tcp dpt:25
0 0 DROP tcp — * * 80.98.100.0/24 0.0.0.0/0 tcp dpt:25