dotnet/Documentation/compatibility/serialization-deserialization-of-mailmessage-objects.md

Deserialization of MailMessage objects serialized under the .NET Framework 4.5 may fail

Scope

Minor

Version Introduced

4.5

Source Analyzer Status

Investigating

Change Description

Starting with the .NET Framework 4.5, T:System.Web.Mail.MailMessage objects can include non-ASCII characters. In the .NET Framework 4, only ASCII characters are supported. T:System.Web.Mail.MailMessage objects that contain non-ASCII characters and that are serialized under the .NET Framework 4.5 or later cannot be deserialized under the .NET Framework 4.

• Quirked
• Build-time break

Recommended Action

Ensure that your code provides exception handling when deserializing a T:System.Web.Mail.MailMessage object.

Affected APIs

T:System.Web.Mail.MailMessage

Category

Networking