number of DKIM-Signature headers, disable DKIM verification to avoid
a resource-consumption attack. The limit is set at twenty.
+JH/05 Bug 2273: Cutthrough delivery left a window where the received messsage
+ files in the spool were present and unlocked. A queue-runner could spot
+ them, resulting in a duplicate delivery. Fix that by doing the unlock
+ after the unlink. Investigation by Tim Stewart.
+
Exim version 4.91
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