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SmtpMail.SmtpServer Property

Gets or sets the name of the SMTP relay mail server to use to send e-mail messages. Recommended alternative: System.Net.Mail.

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

public static string SmtpServer { get; set; }

Property Value

Type: System.String
The name of the e-mail relay server.

If your local SMTP server (included with Windows 2000 and Windows Server 2003) is behind a firewall that blocks any direct SMTP traffic (through port 25), you will need to find out if there is a smart host available on your network that is allowed to relay SMTP messages to the Internet.

A smart host is an SMTP server with the permissions to relay outgoing e-mail messages directly to the Internet from internal SMTP servers. A smart host should be able to simultaneously connect to both the internal network and the Internet in order to work as the e-mail gateway.

//This example assigns the name of the mail relay server on the  
//local network to the SmtpServer property.
SmtpMail.SmtpServer = "RelayServer.Contoso.com";

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
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