To ensure the Queue Items are processed in the correct order, the Postpone property of the Add Queue Item activity should be used. The Postpone property allows you to specify the date and time after which the queue item can be processed. This property can be used to prioritize the queue items based on the order of the emails received. For example, if the email was received at 10:00 AM, the Postpone property can be set to 10:00 AM or later, so that the queue item will not be processed before that time. The Postpone property can be set to a DateTime value, a variable, or an expression that returns a DateTime value. For example, the following expression sets the Postpone property to the current date and time plus one hour:

VB DateTime.Now.AddHours(1)