my company mail system have been blocked by some of my clients stating SpamCop as the source. I am not sure if the clients are just using the list or if they filter their mail through SpamCop. we can not send mail to our client,so many urgent mail delay,we faced huge problem ! Could you help us settle it ! Any help would be much appreciated. we got follow information when we send mail : The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was 'traffic.lax[at]oecgroup.com'. Subject 'Re: OCEAN ETA TO DALLAS [HBL#OERT204701800832] [ Cust. Ref #SA3030-80]', Account: 'mail.oceanicbridge.com', Server: 'mail.oceanicbridge.com', Protocol: SMTP, Server Response: '451 Blocked - see http://www.spamcop.net/bl.shtml?18.104.22.168', - I have checked MANY spam blocking sites and this is the only one I am listed on.