non-null, to avoid issues with sites running BATV. Previously reports were
sent with an empty envelope sender so looked like bounces.
+JH/23 Bug 2318: Fix the noerror command within filters. It wasn't working.
+ The ignore_error flag wasn't being returned from the filter subprocess so
+ was not set for later routers. Investigation and fix by Matthias Kurz.
+
Exim version 4.91
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