HS/02 Support Avast multiline protoocol, this allows passing flags to
newer versions of the scanner.
+JH/28 Ensure that variables possibly set during message acceptance are marked
+ dead before release of memory in the daemon loop. This stops complaints
+ about them when the debug_store option is enabled. Discovered specifically
+ for sender_rate_period, but applies to a whole set of variables.
+
Exim version 4.90
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