|  | Mail | 
 Classes
Classes| Class | Description | |
|---|---|---|
|   | SmtpClient | An SMTP client that can be used to send email messages. | 
|   | SmtpCommandException | An SMTP protocol exception. | 
|   | SmtpDataFilter | An SMTP filter designed to format a message stream for the DATA command. | 
|   | SmtpProtocolException | An SMTP protocol exception. | 
|  | SmtpResponse | An SMTP command response. | 
 Interfaces
Interfaces| Interface | Description | |
|---|---|---|
|  | ISmtpClient | An interface for an SMTP client. | 
 Enumerations
Enumerations| Enumeration | Description | |
|---|---|---|
|   | DeliveryStatusNotificationType | Delivery status notification type. | 
|   | SmtpCapabilities | Capabilities supported by an SMTP server. | 
|   | SmtpErrorCode | An enumeration of the possible error codes that may be reported by a SmtpCommandException. | 
|  | SmtpStatusCode | An enumeration of possible SMTP status codes. |