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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 SmtpClient.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 SmtpClient.PickupDirectoryLocation property override the configuration file settings.