System.Net.Mail.SmtpClient.Send/Exchange latency

The C# application sends an email using System.Net.Mail.SmtpClient.S开发者_如何学运维end The application's log file shows that the Send method succeeded at 11:39 When I open the email in Outlook and do File|Properties, it shows Sent: 11:39 AM Received: 11:41 AM

If I go to View|Options , the headers show: Received: from XXX by YYY with Microsoft SMTPSVC [...] 11:41:15 [...] Date: 9 Dec 2009 11:38:51 [...] X-OriginalArrivalTime: [...] 11:41:15.0250

So my question is - if the Send method came back at 11:39, but the server only received it at 11:41, where did the email spend the 2 minutes? In other words, is there something that needs to be configured on the machine that runs the application or on the Exchange server?

The first thing to check is that the client and Exchange server have their times in sync. Usually there's more noticeable problems when a server like Exchange is out of sync time-wise, but it's possible to be a couple minutes off and not be noticed for a while.