A poster on macOSXHints notes that 
Leopard Mail now supports Spotlight sophistication in its searches.
This means that you can use a limited set of operators to construct more complex and better-targeted searches than you ever could before. Spotlight in Leopard can filter results by metadata categories like “author:” or “date:”. Leopard Mail does the same thing.
For example, this search lets me quickly find all the emails sent from a Christ Church South Yarra email address that contain the word “beer”. Not as many as one might think! Still, the search enables me to find quickly that the answer is Boags.
Another search from work yesterday quickly finds all the emails from the Director of Communications at College which contain the word “font”. Without too much browsing I discover that Optima is the approved font for all external communications and can get on with actually writing one.
A third example. This search lists all the emails that have arrived since 3 December that mention Tiger, including the one from a Hawk Wings reader who wonders why I don’t post about Tiger Mail anymore.
Not everything about Leopard Mail is focussed on greater productivity, but this smarter way of digging through your email and finding what you are looking for is a great leap forward.
After a few posts carping on about this or that failing in Mail.app, it’s good to stumble on something like this and remember what a truly great email client it is.
