SmtpClient.Host Property

Gets or sets the name or IP address of the host used for SMTP transactions.

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

public string Host { get; set; }

Property Value

Type: System.String
A String that contains the name or IP address of the computer to use for SMTP transactions.

ExceptionCondition
ArgumentNullException

The value specified for a set operation is null.

ArgumentException

The value specified for a set operation is equal to String.Empty ("").

InvalidOperationException

You cannot change the value of this property when an email is being sent.

The value of the Host property can also be set using constructors or the application or machine configuration file. For more information, see <mailSettings> Element (Network Settings).

If information is specified using this property, this information overrides the configuration file settings.

The following code example demonstrates sending an e-mail message by using the host and port specified in an application configuration file.

		public static void CreateTestMessage4(string server)
		{
			MailAddress from = new MailAddress("ben@contoso.com");
			MailAddress to = new MailAddress("Jane@contoso.com");
			MailMessage message = new MailMessage(from, to);
			message.Subject = "Using the SmtpClient class.";
			message.Body = @"Using this feature, you can send an e-mail message from an application very easily.";
			SmtpClient client = new SmtpClient(server);
			Console.WriteLine("Sending an e-mail message to {0} by using SMTP host {1} port {2}.",
				 to.ToString(), client.Host, client.Port);

      try {
			  client.Send(message);
			}
			catch (Exception ex) {
			  Console.WriteLine("Exception caught in CreateTestMessage4(): {0}", 
                    ex.ToString() );			  
		  }
		}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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