Another question. In the submission guidelines for a few of the agencies I want to query, their website says, write to the "Submissions Department", instead of any particular agent. In such cases, is it ok to write "Dear Agent" in the query letter, because I don't know which agent to address? Or, if I do get to know the name of a specific agent, is it advisable to write to her (and thus ignoring the submission guidelines)?
In this particular case, it is okay to write "Submissions Department" and not "Dear Agent." In most cases, however, the submissions department is usually defined as the corner of the agent's desk where the pile of mail was dropped in a rush to get to the phone.