how to Find ipof sender to know whether mail is fake or genuine

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Most of the business people always face this problem. It's about fake or genuine business inquiry. fake queries are generally generated by the competitors to know about someones price policy, business terms and other information. Usually, businessman make multiple fake business email id on different country specific mail service provider. for example a website with tld .ae, .co.uk., .co.in, .de etc. How to identify the ip of actual sender, not the mail service provider.