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SmtpClient.ClientCertificates Property

Specify which certificates should be used to establish the Secure Sockets Layer (SSL) connection.

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

public X509CertificateCollection ClientCertificates { get; }

Property Value

Type: System.Security.Cryptography.X509Certificates.X509CertificateCollection
An X509CertificateCollection, holding one or more client certificates. The default value is derived from the mail configuration attributes in a configuration file.

Client certificates are, by default, optional; however, the server configuration might require that the client present a valid certificate as part of the initial connection negotiation.

NoteNote

The Framework caches SSL sessions as they are created and attempts to reuse a cached session for a new request, if possible. When attempting to reuse an SSL session, the Framework uses the first element of ClientCertificates (if there is one), or tries to reuse an anonymous sessions if ClientCertificates is empty.

Windows 95, Windows 98, Windows 98 Second Edition, Windows Millennium Edition Platform Note: The Framework attempts to reuse an SSL session only if a client certificate is not required.

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 = "jane@contoso.com";
			string from = "ben@contoso.com";
			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;
			client.Send(message);
		}

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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