Specifies how outgoing email messages will be handled.
Assembly: System (in System.dll)
Delivery methods include:
An SMTP server.
Moving the email into the pickup directory for IIS, which then delivers the message.
Moving the email to a directory specified by PickupDirectoryLocation for later delivery by another application.
The default value for this property can also be set in a machine or application configuration file. Any changes made to the PickupDirectoryLocation property override the configuration file settings.