DsnNotifyCondition Enumeration
Specifies events that trigger ESMTP server to send delivery status notification back to the sender of the message.

Namespace: MailBee.SmtpMail
Assembly: MailBee.NET (in MailBee.NET.dll) Version: 12.4 build 677 for .NET 4.5
public enum DsnNotifyCondition
  Member nameValueDescription
Default0 Send notificaton at the server discretion. Usually, this is equivalent to either Failure or bitwise combination of Failure and Delay.
Failure1 Notify if message delivery fails.
Delay2 Notify if message delivery is delayed.
Success4 Notify if the message delivery succeeds.
Always7 Notify always. This value is a bitwise combination of Failure, Delay, and Success.
Never8 Do not send notification under any circumstances.

If the SMTP server the message it submitted to supports ESMTP DSN (Delivery Status Notification) extension, it's possible to tell the server to send notifications on message delivery (successful, failed, or both) to the message sender.

If the SMTP server does not support ESMTP DSN, this value is ignored.

See Also