MailMessage Constructor (String, String, String, String)

Initializes a new instance of the MailMessage class.

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

public MailMessage(
	string from,
	string to,
	string subject,
	string body


Type: System.String

A String that contains the address of the sender of the e-mail message.

Type: System.String

A String that contains the address of the recipient of the e-mail message.

Type: System.String

A String that contains the subject text.

Type: System.String

A String that contains the message body.


from is null.


to is null.


from is Empty ("").


to is Empty ("").


from or to is malformed.

The properties for the new MailMessage object are initialized as follows:





  • to

  • subject

  • body

By default, the subject and content are assumed to use the default encoding based on local computer settings. Use the BodyEncoding and SubjectEncoding properties to specify different encodings.

The following code example demonstrates calling this constructor.

		public static void CreateTimeoutTestMessage(string server)
			string to = "";
			string from = "";
			string subject = "Using the new SMTP client.";
			string body = @"Using this new feature, you can send an e-mail message from an application very easily.";
			MailMessage message = new MailMessage(from, to, subject, body);
			SmtpClient client = new SmtpClient(server);
			Console.WriteLine("Changing time out from {0} to 100.", client.Timeout);
			client.Timeout = 100;
			// Credentials are necessary if the server requires the client  
			// to authenticate before it will send e-mail on the client's behalf.
			client.Credentials = CredentialCache.DefaultNetworkCredentials;

      try {
			catch (Exception ex) {
			  Console.WriteLine("Exception caught in CreateTimeoutTestMessage(): {0}", 
                    ex.ToString() );			  

.NET Framework

Supported in: 4.6, 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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