Hm, all caps subject rule may need a little tweak....

[jdow <jd...@earthlink.net>]

"[Apcupsd-users]LETTER", a quite obvious spam, probably could safely
have triggered an all caps rule on the subject if it ignored content
between the braces.

This might be a useful rule enhancement, not that this particular spam
made it even CLOSE to getting through the filters here.

{^_^}