If you’re using Debian 7 and installing the software through the shell script, then you might need to reboot the system for the Spam Assassin to start. It may fail to start automatically sometimes - that’s why the Spam Check may freeze. This behavior has been fixed in LUCY 2.2. In LUCY 2.2-2.5 the SPAM check will verify over 200 online DB's. It takes at least 10-15 minutes for this check to be finished! Starting from 2.6 the SPAM check is optional and not enabled by default.