In the process of migrating from SharePoint 2010 to 2016 and ran into a small problem.

When trying to get the email property from the SPUser class, it returned a value of domain\userName. Clearly, this is not correct and caused some other issues.

Sample code

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$web = Get-SPWeb "https://webapp.taco/toppings/cheese"
$userEnsure = $web.EnsureUser("domain\yourNameHere")
write-host $userEnsure.Email
Running this returned domain\yourNameHere, when it should have returned yourname@domain.com.
Navigate to Central Admin, then cruise over to your User Profile Service. Once there, run a full synchronization.

Profile Service –> Synchronization –> Start Profile Synchronization –> Start Full Synchronization
Run the PowerShell script again, and it will return the correct data.
Same idea as above but using the SharePoint ClientContext.
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using (ClientContext clientContext = new ClientContext("https://webapp.taco/toppings/cheese"))
 {
     Web web = clientContext.Web;
 
     clientContext.Load(web);
     clientContext.Load(web.CurrentUser);
     clientContext.ExecuteQuery();
 
     var userEmail = web.CurrentUser.Email;
}