Gets or sets a bool value that controls whether the System.Net.CredentialCache.DefaultCredentials are sent with requests.
Syntax
public bool UseDefaultCredentials { get; set; }
Value
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Remarks
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 System.Net.Mail.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 for system.net.
If the SmtpClient.UseDefaultCredentials property is set to false, then the value set in the SmtpClient.Credentials property will be used for the credentials when connecting to the server. If the SmtpClient.UseDefaultCredentials property is set to false and the SmtpClient.Credentials property has not been set, then mail is sent to the server anonymously.
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.
Requirements
Assembly: System (in System.dll)
Assembly Versions: 2.0.0.0, 4.0.0.0
Since: .NET 2.0