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Some companies do not want to deal with hard copy resumes, and will specifically request email or other submission. If the job ad is not specific, feel free to ask for clarification. For jobs that aren't specific about email or online only, feel free to mail your resume in anyway. It can be a concrete way to demonstrate your interest in the position beyond simply submitting your application and help you stand out in the crowd. Just make sure you definitely apply as the company requests. In some cases, the correct name will be in the job ad, or readily available on the company's website. Not only with your resume get in the hands of someone who will actually be able to act on it, it will also demonstrate that you took the time to research the business and know something about it.  If the name is not easily available, a little sleuthing can track it down. An online search using the company's name and department you want to work in may find it. Additionally, calling the company's main line and asking the receptionist for the name of the manager who oversees the department you are applying to can get it.  Social networks, especially business-related ones like LinkedIn, are also a good way to track down people in certain businesses. You may not get the hiring manager specifically, but find someone who does. Do not address the envelope to an unnamed "Whom it may concern" or "Person who does the hiring." Your resume may not get through to where it needs to be, and it looks like you did not attempt to learn anything about the company. Companies may have multiple addresses associated with them, including a mail address, street address, or addresses for different branches and facilities. Make sure you have the correct mailing address before starting your envelope. This address may be on the job ad, or should be available on the company's website. If you are still unsure, call the company and ask.
Follow employer instructions. Get the correct name for the hiring manager. Get the correct mailing address.