namespace System.Net.Mail
    [AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Constructor | AttributeTargets.Method, AllowMultiple = true, Inherited = false)]
    [Obsolete("Code Access Security is not supported or honored by the runtime.", DiagnosticId = "SYSLIB0003", UrlFormat = "{0}")]
    public sealed class SmtpPermissionAttribute : CodeAccessSecurityAttribute
NetFx Compat Lab
0.8 %
Reference this API
.NET Core
.NET Framework
.NET Standard 2.02.1
Information specific to net9.0

System.Security.Permissions , Version=, PublicKeyToken=cc7b13ffcd2ddd51

System.Security.Permissions , Version=, PublicKeyToken=cc7b13ffcd2ddd51


Your project needs a package reference to System.Security.Permissions.

Package System.Security.Permissions net9.0
Obsolete SYSLIB0003: Code Access Security is not supported or honored by the runtime.
Platform Restrictions

This API is supported on all platforms.

  • Built-in API
  • Package-provided API

An error has occurred. This application may no longer respond until reloaded. Reload 🗙