AND is the default. That is, a search for
returns all messages that contain those words anywhere.
QUOTES (") allow searches for phrases. That is, a search for
returns all messages that contain that exact phrase..
MINUS (-) eliminates words. That is, a search for
returns all messages that contain
You can MINUS a phrase in QUOTES, like
insomnia -"sleep medication."
The engine is not case-sensitive and searches the title, body, and author.