that the byte-sized flag variables are not interspersed among pointer
variables, giving a better chance of good packing by the compiler.
+JH/22 Bug 1896: Fix the envelope from for DMARC forensic reports to be possibly
+ non-null, to avoid issues with sites running BATV. Previously reports were
+ sent with an empty envelope sender so looked like bounces.
+
Exim version 4.91
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