部分信件中文寄信者及主題不見

1. 解決方式：

   [root@mail www]# diff -uN squirrelmail-1.4.22.bak/functions/i18n.php
   squirrelmail-1.4.22/functions/i18n.php
   --- squirrelmail-1.4.22.bak/functions/i18n.php	2016-02-03 07:18:56.669214182
   +0800
   +++ squirrelmail-1.4.22/functions/i18n.php	2016-03-07 09:26:33.658620852
   +0800
   @@ -184,7 +184,8 @@
        }
    
        /* All HTML special characters are 7 bit and can be replaced first */
   -    if (! $save_html) $string = htmlspecialchars ($string);
   +    #if (! $save_html) $string = htmlspecialchars ($string);
   +	if (! $save_html) $string = htmlspecialchars ($string, ENT_COMPAT,
   'ISO-8859-1');
        $charset = strtolower($charset);
    
        set_my_charset();