MailMessage.BodyEncoding Property

The value specified for the BodyEncoding property sets the character set field in the Content-Type header. The default character set is "us-ascii".

If you set the BodyEncoding property to UTF8, Unicode, or UTF32, the Framework selects a TransferEncoding of Base64 for this MailMessage.

The following code example demonstrates creating a mail message that uses UTF8 encoding.

MailMessage message = new MailMessage(from, to);
message.Body = "This is a test e-mail message sent by an application. ";
// Include some non-ASCII characters in body and subject. 
string someArrows = new string(new char[] {'\u2190', '\u2191', '\u2192', '\u2193'});
message.Body += Environment.NewLine + someArrows;
message.BodyEncoding =  System.Text.Encoding.UTF8;
message.Subject = "test message 1" + someArrows;
message.SubjectEncoding = System.Text.Encoding.UTF8;

.NET Framework

.NET Framework Client Profile

Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Reference