Spamfilter rules: single user overridden by domain rule
If I set an explicit filter/ruleset on a user - and have a different one on the domain the one of the domain is taken in account. If I have a setting on a single user I would assume that this one will be taken (not the more general on the whole domain)
Even better it would be if the priority would be taken in account in some way: The priority (as can be seen on the spamfilter/user-table) is set by the system (per default) to domain: 5 and user: 1. the above mentioned don't work on these defaults and even not on the interchanged ones (just an idea :-) ).