Today's agent isn't really an agent, but an agent's assistant. And I don't know if the Rejecter is a man or woman, or their name. But this anonymous assistant is invaluable in helping navigate the do's and don'ts of querying, because it's a whole lot easier to be honest when no one knows who you are.
However, I can see from the posts that The Rejecter is a published fiction author. So, since I can't give you a bio and an agency website, we'll get straight to the posts that caught my eye.
The Rejecter answers questions like: