Solve this debate please.
I am writing a cover letter to apply for a guidance job in my school system. There is no hiring person, just "Department of Personnel". I read on a cover letter guide if there is no specific person to name don't write a greeting at all and just go from the address to your opening paragraph.
Dad (and me before reading that) thinks that all cover letters should start with
Dear sir or madame, or To whom it may concern,
if there is no name specified.
What say you?