RBL Testing
We’re now testing various RBL (Real Time Blacklists) with our email server software. Currently if a sending email server is flagged as being a source of spam (being listed in the RBL) there will be a header line (X-Blacklisted) added to that email indicating the IP address of the sending server and the RBL that IP was found within.
Provided that the testing proves to be successful in blocking spam and not causing too much ‘collatoral damage’ the warning mechanism will be changed to block those senders.
If you do happen to notice legitimate email coming in with X-Blacklisted headers, we can add those to our manual ‘whitelist’ to prevent them from being blocked whenever the switch to blocking from warning would be made.
Additionally, as rampant “sources” of spam, the following domains have been manually blacklisted server-wide:
canada.com
india.com
hongkong.com
china.com
