Apple's dev dox provide info for File Metadata Query Expression Syntax.
The problem I'm having is that I want to do 'A and not(B or C)' but I don't see how to do it. It seems I can only do 'A and ((not B) or (not C))' and that's not what I want. There's a nice truth table generator here that demonstrates the problem: http://turner.faculty.swau.edu/mathematics/materialslibrary/truth/
I'm thinking that it's not possible given what Spotlight supports, per the dox.
SOLVED
Some details on the problem I'm trying to solve: I want to see email to me from outside the company domain AND not webex generated (it is used for meeting updates, etc.) MS Outlook 2011 (Mac) uses OS X Spotlight search engine to filter email with a 'Raw Query'.
The working query (thanks, Renzo) is:
com_microsoft_outlook_recpient_email_addresses == "jsmith@example.com" && com_microsoft_outlook_author_email_addresses != "*@example.com" && com_microsoft_outlook_author_email_addresses != "*@webex.com"