diff --git a/src/libraries/System.Net.Mail/ref/System.Net.Mail.cs b/src/libraries/System.Net.Mail/ref/System.Net.Mail.cs
index 04de1380ed0b28..66a663d05940de 100644
--- a/src/libraries/System.Net.Mail/ref/System.Net.Mail.cs
+++ b/src/libraries/System.Net.Mail/ref/System.Net.Mail.cs
@@ -384,6 +384,14 @@ public static partial class Text
             public const string Rtf = "text/rtf";
             public const string Xml = "text/xml";
         }
+        public static partial class Video
+        {
+            public const string Mp4 = "video/mp4";
+            public const string Mpeg = "video/mpeg";
+            public const string Ogg = "video/ogg";
+            public const string QuickTime = "video/quicktime";
+            public const string WebM = "video/webm";
+        }
     }
     public static partial class MediaTypeMap
     {
diff --git a/src/libraries/System.Net.Mail/src/System/Net/Mime/MediaTypeNames.cs b/src/libraries/System.Net.Mail/src/System/Net/Mime/MediaTypeNames.cs
index d94769c60b4ac1..ffdc4e7deeefc7 100644
--- a/src/libraries/System.Net.Mail/src/System/Net/Mime/MediaTypeNames.cs
+++ b/src/libraries/System.Net.Mail/src/System/Net/Mime/MediaTypeNames.cs
@@ -165,5 +165,24 @@ public static class Text
             /// <summary>Specifies that the <see cref="MediaTypeNames.Text"/> data is in XML format.</summary>
             public const string Xml = "text/xml";
         }
+
+        /// <summary>Specifies the kind of video data in an email message attachment.</summary>
+        public static class Video
+        {
+            /// <summary>Specifies that the <see cref="MediaTypeNames.Video"/> data is in MP4 format.</summary>
+            public const string Mp4 = "video/mp4";
+
+            /// <summary>Specifies that the <see cref="MediaTypeNames.Video"/> data is in MPEG format.</summary>
+            public const string Mpeg = "video/mpeg";
+
+            /// <summary>Specifies that the <see cref="MediaTypeNames.Video"/> data is in Ogg format.</summary>
+            public const string Ogg = "video/ogg";
+
+            /// <summary>Specifies that the <see cref="MediaTypeNames.Video"/> data is in QuickTime format.</summary>
+            public const string QuickTime = "video/quicktime";
+
+            /// <summary>Specifies that the <see cref="MediaTypeNames.Video"/> data is in WebM format.</summary>
+            public const string WebM = "video/webm";
+        }
     }
 }