Currently, blocklist.de has the following Stats/User:
Daily Mails: ~400100
Web-Traffic: ~60 GB
RBL-/API-Traffic: ~80 GB (all Mirrors)
Mail (In/Out)-Traffic: ~~900 GB
Traffic over IPv6 (Mail, Web..): ~3GB
To this data, there comes 3TB Traffic between the Web-/Mail-Server and the MySQL-Server. The MySQL-Server sends over ~4,7 GB each Hour out.
The Mysql-Server use now 40% from 32GB Ram. And the System-Load is in average on 0.80 .
The WebServer is using not full of 9GB Ram and the System-Load is under 1 (thanks nginx). The open Connections are ~7000
The cpmplete Traffic from all Systems are round about 1,5TB in January 2013.