Use the System.Net.Mail.SmtpDeliveryMethod enumeration as a parameter to the SmtpClient.DeliveryMethod property to specify the delivery method.
| Member Name | Description |
|---|---|
| Network |
Email is sent through the network to an SMTP server. |
| PickupDirectoryFromIis |
Email is copied to the pickup directory used by a local Internet Information Services (IIS) for delivery. |
| SpecifiedPickupDirectory |
Email is copied to the directory specified by the SmtpClient.PickupDirectoryLocation property for delivery by an external application. |