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SmtpClient.UseDefaultCredentials Property

Gets or sets a Boolean value that controls whether the DefaultCredentials are sent with requests.

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

'Declaration
Public Property UseDefaultCredentials As Boolean

Property Value

Type: System.Boolean
true if the default credentials are used; otherwise false. The default value is false.

ExceptionCondition
InvalidOperationException

You cannot change the value of this property when an e-mail is being sent.

Some SMTP servers require that the client be authenticated before the server sends e-mail on its behalf. Set this property to true when this SmtpClient object should, if requested by the server, authenticate using the default credentials of the currently logged on user. For client applications, this is the desired behavior in most scenarios.

Credentials information can also be specified using the application and machine configuration files. For more information, see <mailSettings> Element (Network Settings).

If the UseDefaultCredentials property is set to false, then the value set in the Credentials property will be used for the credentials when connecting to the server. If the UseDefaultCredentials property is set to false and the Credentials property has not been set, then mail is sent to the server anonymously.

Caution noteCaution

If you provide credentials for basic authentication, they are sent to the server in clear text. This can present a security issue because your credentials can be seen, and then used by others.

The following code example demonstrates using this property.

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

.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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