'not enabled' spamfilter
We have a client which wants to disable spam filtering for some mailboxes - the default spamfilter description of '- not enabled -' sounds like exactly what they want, but does not do what it says - ie. the spam filter is not disabled by selecting that, it actually is set to the domain's default policy (or I suppose the server-wide default if the domain does not have anything set). Renaming '- not enabled -' would help clarify that, maybe to '- default -' or '- use default -' ?