mode until after various protocol state checks.
Fixes CVE-2020-BDATA reported by Qualys.
+HS/03 Die on "/../" in msglog file names
+
+QS/01 Creation of (database) files in $spool_dir: only uid=0 or the euid of
+ the Exim runtime user are allowed to create files.
+
Exim version 4.94
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