Research the company which has made contact to see if their mailing addresses are the same, to assure that a scam company is not just using their name.
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One can send a direct email to a celebrity by finding them on a social media network or a legitimate website, twitter, facebook or their own website, look for the contact section and write them a message.
Read the email thoroughly to see if it is legitimate
It might be. Be careful with any email you receive, especially unsolicited emails. If an email claims to be from GMail, that doesn't ensure it really is. A common trick used by scammers is to write in the name of a legitimate business - but then direct you to a website which might look similar to the legitimate website, or at have an address that is similar, but not identical.
Yes, the website verifyemailaddresses.org is legitimate and free. As of July 2013, at the website any email address can be entered to find out if the email address does exist.
No, this is not an active domain.
what is the direct address to email bernard arnault - LVMH or his direct mailing address?
There's no direct method of doing so, beyond simply asking.
Attn is short for Attention. One would use this designation to direct an email to a specific person when the email is sent to a generic e-mail address, such as a departmental e-mail address.
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Large organizations do not generally submit job offers or conditions of employment by email. If you already met with them in person, the email is probably legitimate.