SmtpClient.Port Property


Gets or sets the port used for SMTP transactions.

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

member Port : int with get, set

Property Value

Type: System.Int32

An Int32 that contains the port number on the SMTP host. The default value is 25.

Exception Condition

The value specified for a set operation is less than or equal to zero.


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

The value of the Port property can also be set using constructors or the application or machine configuration file. For more information about using configuration files, 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.

No code example is currently available or this language may not be supported.


to set the Port property. Associated enumeration: SmtpAccess.ConnectToUnrestrictedPort.

.NET Framework
Available since 2.0
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