Norman posted a topic in SpamCop Blocklist HelpThere are two smtp anti-spam appliances for receiving the internet mailsin my company, RBL(real-time blackhost list) function is enabled to include 'bl.spamcop.net' for checking the sender's mail address. however, our appliance couldn't receive some internet email with error 'Mail from x.x.x.x refused, see RBL server bl.spamcop.net', I checked against the refused email's sender address which should not in the blacklist. And my company's domain is not in the blacklist as well. So, my question is why the bl.spamcop.net will refuse those the mail sent from a non-blocking sender list. I would be appreciated if someone have an advice. Thank you.