+PH/10 Fixed another bug related to PH/04 above: if an incoming message had a
+ syntactically invalid From: or Reply-to: line, and a filter used this to
+ generate an autoreply, and therefore failed to obtain an address for the
+ autoreply, Exim could try to deliver to a non-existent relative file
+ name, causing unrelated and misleading errors. What now happens is that
+ it logs this as a hard delivery error, but does not attempt to create a
+ bounce message.
+