To use advanced combined searches in Mac OS X Mail:
- Combine search terms and the commands "and", "or" and "not" with parentheses to form complex search expressions.
For example, "spam and (heinz or guide not cats)" will find all messages that contain both "spam" and "heinz" (but not "cats"), both "spam" and "guide" (but not "cats") or both "spam", "heinz" and "guide", but not "cats".

