



Qmail
- Get the current 'tcpserver' sources from http://cr.yp.to/ucspi-tcp.html and follow the instructions on the site for setting up Qmail to work with 'tcpserver'. Most Qmail sites will probably have already done so although older sites may have to upgrade their 'tcpserver' to version 0.88 containing 'rblsmtpd' support.
- Add "rblsmtpd -r bl.spamcop.net" to the startup arguments for 'tcpserver'. You can also run multiple DNSBLs by adding more "-r" args to it, i.e. "rblsmtpd -r bl.spamcop.net -r relays.ordb.org".
- restart the mail server.
[Append to This Answer]