This is my suggestion as I have written many cover letters in the last 2 years and have some that are pre written for convenience. My "Adams Resume Almanac" says you should address the cover letter to the "hiring authority or the human resources director" and you should always know the name of the person you are sending it to, and if you don't... call and ask.
I was told in the few interviews I have had that it was my well written cover letter and professional resume that got me the interview.
This is ok, right? I'm not breaking any rules or making anyone mad at me for this comment, Right?
Trust in God...Everyone else keep your hands where I can see them!