But just because they are a real company doesn't mean that the solicitation you might have received is real. Almost every authentic MSC has had their name stolen by scammers. If you did not sign up with the company, and/or if they are offering you money up front, sending you money that you have to send back part of via wire, etc, it probably is from a scammer.
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“Lying in bed would be an altogether perfect and supreme experience if only one had a colored pencil long enough to draw on the ceiling."
~Gilbert K. Chesterton