must insure that the values they pass
 do not contain non US-ASCII characters. The methods in this class 
 help do this. <p>

 The <code>getHeader</code> family of methods on MimeMessage and
 MimeBodyPart return the raw header value. These might be encoded
 as per RFC 2047, and if so, must be decoded into Unicode Strings.
 The methods in this class help to do this. <p>

 Several System properties control strict conformance to the MIME
 spec.  Note that these are not session properties but must be set
 globa