Datetime of a correspondance


I have sent an e-mail to my RT system that has been recorded on the database, and then forwarded (because a Scrip ask so) to the Requestor. 1 minutes later, the Requestor replied and his correspondance has been recorded into the database but with a datetime 2 minutes prior the 1st message…
So my question: the datetime associated with a correspondance, is the datetime locally calculated by the RT server or it takes the “Date:” field of the mail?
If it’s the 2nd case… why? Is it not more logical to take the server local datetime?

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