This is using MS Exchange 2010 server. Recently, my users always got mails rejected when they attempt to send mails to @abc.com email domain. The replied message is as follows:
ddcbw1.etn.com #554 5.7.1 Blocked by Reputation Enabled Defense: go to http://intercept.borderware.com/lookup?ip=
<my mail server IP>&u=2dd6d743dfd267b8&d=7
I checked my mailserver IP against MXToolsbox, and found that it was only listed in one of the RBL, called "justspam". Mails sent to other domain without problem. What could be the problem?
Thanks in advance.