In the Plesk 6 control panel, I see where one can blacklist sites from the email server by domain name. Is there any way to blacklist by IP number instead? I find it annoying that I can whitelist by IP, but cannot do the same for blacklist.

Does Plesk 7.(what ever we're up to now) allow blacklisting by IP? This feature alone would encourage me to upgrade if it can't be done in Plesk 6.