FWIW, i see some chatter on an anti-spam discussion list dating back to March 2013 (happy anniversary) making note of the /24 surrounding these IPs as being highly questionable:
185.18.33.78.in-addr.arpa mailer1.ibwmail.com http://mailer1.ibwmail.com/. 186.18.33.78.in-addr.arpa mailer2.ibwmail.com http://mailer2.ibwmail.com/. 187.18.33.78.in-addr.arpa mailer5.thetradingfloor.co.uk http://mailer5.thetradingfloor.co.uk/. 188.18.33.78.in-addr.arpa mailer4.ibwmail.com http://mailer4.ibwmail.com/.
Hrrrm...which list is this? I thought my personal archives were pretty comprehensive (although granted the mail search function has been awful since Yosemite).
But in any event, thank you!
Anne
Anne P. Mitchell, Attorney at Law CEO/President, Institute for Social Internet Public Policy Member, Cal. Bar Cyberspace Law Committee Member, Asilomar Microcomputer Workshop Committee Author: Section 6 of the Federal CAN-SPAM Act of 2003 Ret. Professor of Law, Lincoln Law School of San Jose Ret. Chair, Asilomar Microcomputer Workshop