SmtpClient.ClientCertificates Property

Definition

Namespace:

System.Net.Mail

Assembly:

System.Net.Mail.dll

Source:

SmtpClient.cs

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

public:
 property System::Security::Cryptography::X509Certificates::X509CertificateCollection ^ ClientCertificates { System::Security::Cryptography::X509Certificates::X509CertificateCollection ^ get(); };

public System.Security.Cryptography.X509Certificates.X509CertificateCollection ClientCertificates { get; }

member this.ClientCertificates : System.Security.Cryptography.X509Certificates.X509CertificateCollection

Public ReadOnly Property ClientCertificates As X509CertificateCollection

Property Value

X509CertificateCollection

An X509CertificateCollection, holding one or more client certificates. The default value is derived from the mail configuration attributes in a configuration file.

Examples

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 email 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 email on the client's behalf.
    client.UseDefaultCredentials = true;
                client.EnableSsl = true;
    client.Send(message);
}

Remarks

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.

Note

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.

See also

• MailSettings Element (Network Settings)