public void addHeader(String name,String val){
  mMsgHeader=mMsgHeader + name + ": "+ val+ mLineDelimiter;
  addInternalHeaderFields(name,val);
}

public void addHeader ( String name , String val ) { mMsgHeader = mMsgHeader + name + ": " + val + mLineDelimiter ; addInternalHeaderFields ( name , val ) ; }
add a header with the name and value given . it will be appended to the header string .
