In the interview series cast on cover letters, you discuss closing with a commitment to follow up by such-and-such date. How about when one submits a resume against opening on Monster or the like where the hiring manager's name (or even the recruiter's for that matter) isn't known? Should one omit the 3rd paragraph in that case?
In a similar vein, what should one put in the salutation of a letter where the recipient is unknown? I have always used "Dear Sir or Madam:", but it has been suggested to me to use "Dear Recruiter:".