This can be confusing for someone, especially when you don't know who you are addressing. The greeting in some ways can be one of the most important things in the letter. There was a survey done where hiring managers were asked about it. Here are the results of a study conducted by Saddleback College on what they preferred:
Dear Hiring Manager (38%)
To whom it may concern (26%)
Dear Sir/Madam (18%)
Correctly addressing a cover is actually fairly easy to do. At least it's fairly easy if you know what the employer prefers. This will increase your chances of getting the job in every instance. It will put your application package at the top of the proverbial stack. Once it's at the top of the stack you have just about assured yourself that you don't have to hunt for a job. Personally, this is what I prefer as I really don't find job hunting is an activity I love doing. Getting that first paycheck however is one I always cherish.
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