Answered by Ashley, Hiring Expert at Cardinal Health, on Wednesday, March 23, 2016
I personally think it is acceptable to address the cover letter as "To Whom It May Concern" if you do not know the recruiter or hiring manager name. In my experience, I often see this on cover letters. I would not address it to a specific person unless you are 100% sure it is the correct person. In my opinion, I think it looks worse to address it to the wrong person rather than using "To Whom It May Concern". Be mindful that not all companies will provide you with the name of the recruiter or hiring manager if you ask for it. For confidentiality reasons, some larger companies may not offer to provide this to you and will instead recommend you address it more general.