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I have their Office 365 E-Mail and I need to have the Created By and Modified By columns refer to their user.

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I've managed to solve it myself

var user = clientContext.Web.SiteUsers;
User targetUser = user.GetByEmail(creatorMail);
newItem["Author"] = targetUser;
newItem["Editor"] = targetUser;
newItem.Update();
clientContext.ExecuteQuery();
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There's a caveats when you update Author and Editor field in CSOM for SharePoint Online. I had inconsistent results so I wrote my discovery in the article: https://ikmoss.wordpress.com/2019/04/29/issues-when-updating-created-by-and-modified-by-fields-in-sharepoint-online-csom/

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