Add option to set up DNSBLs
I think it would be a really good idea to add an option in to ISPConfig 3 to allow the addition of DNSBLs such as the ones from Spamhaus.
I know you can manually add them to Postfix's main.cf file but it would be great to just be able to add the relevant ones in ISPConfig its self rather than edit config files as these get re-written on updates.