JH/56 Make the majority of info read from config files readonly, for defence-in-
depth against exploits. Suggestion by Qualsy.
+ Not supported on Solaris 10.
+
+JH/57 Fix control=fakreject for a custom message containing tainted data.
+ Previously this resulted in a log complaint, due to a re-expansion present
+ since fakereject was originally introduced.
Exim version 4.94