I operate a small ESP and have a well-known trade show company as a client. They utilize a dedciated domain and 6 dedicated IP's bound to that domain to send out important exhibitor and attendee material. All 6 IP's are listed as good on Cisco Senderbase, not blocked at any RBL and not listed by Brightmail anywhere. All 6 IP's are also Senderscore certified by Return Path.
Up until 2 weeks ago, all tests sent to ReturnPath's Inbox Monitor showed 100% inbox penetration to their Brightmail seeds. In addition, we place 100% in the inbox to all seeds, including Gmail.
Now every message shows 100% placement in the spam folder as "Suspected Spam' to their Brightmail seeds. We haven't changed anything on the program, haven't added any new data or made any changes to the network settings.
Has Brightmail and/or Symantec instituted changes that would make these messages now show up as 'Suspected Spam'?