amavisd-new on Ubuntu 14.04 (trusty)
If you get anything like this in your syslog:
Dec 27 20:35:36 web2 amavis[4216]: (!!)TROUBLE in pre_loop_hook: config: no rules were found! Do you need to run ‘sa-update’?
Dec 27 20:35:36 web2 amavis[4216]: (!)_DIE: Suicide () TROUBLE in…