SmtpClient.EnableSsl Property

Note: This property is new in the .NET Framework version 2.0.

Specify whether the SmtpClient uses Secure Sockets Layer (SSL) to encrypt the connection.

Namespace: System.Net.Mail
Assembly: System (in system.dll)

public bool EnableSsl { get; set; }
/** @property */
public boolean get_EnableSsl ()

/** @property */
public void set_EnableSsl (boolean value)

public function get EnableSsl () : boolean

public function set EnableSsl (value : boolean)

Property Value

true if the SmtpClient uses SSL; otherwise, false. The default is false.

You can use ClientCertificates to specify which client certificates should be used to establish the SSL connection. The ServerCertificateValidationCallback allows you to reject the certificate provided by the SMTP server. The SecurityProtocol property allows you to specify the version of the SSL protocol to use.

The following code example establishes an SSL connection with the SMTP server and uses the connection to send an email.

public static void CreateTestMessage(string server)
    string to = "";
    string from = "";
    MailMessage message = new MailMessage(from, to);
    message.Subject = "Using the new SMTP client.";
    message.Body = @"Using this new feature, you can send an e-mail message from an application very easily.";
    SmtpClient client = new SmtpClient(server);
    // Credentials are necessary if the server requires the client 
    // to authenticate before it will send e-mail on the client's behalf.
    client.UseDefaultCredentials = true;
                client.EnableSsl = true;

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0