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How to check if a company is genuine
Check the company's website for a legitimate telephone number and address.
If there is no way to contact this company offline, this may be a red flag that the business is not legitimate. Since emails and domain names are easy to obtain, having an email address is not as trustworthy as offline contact information.
Remember that both phone numbers and addresses are now super easy to fake. There is a whole industry in providing fake area code and 800 numbers.