According to this website, a query letter must conform to very strict criteria, otherwise agents will toss it in the trash unread. You know....first paragraph must pique the agent's interest, give the book title, the genre, how many pages, etc. The second/thirdparagraph(s) must provide a riveting condensation of the plot. The final paragraph must describe the writer's background and previous writing successes.
All of this should be written in 11 point Times Roman with indented paragraphs.
However, most of the successful queries that members have posted have broken just about every rule. So, what gives? I don't get it.