copy a string over itself. The library routine is documented as not
supporting overlapping copies, and on MacOS it actually raised a SIGABRT.
+JH/33 Bug 2338: Fix the cyrus-sasl authenticator to fill in the
+ $authenticated_fail_id variable on authentication failure. Previously
+ it was unset.
+
+JH/36 Harder the handling of string-lists. When a list consisted of a sole
+ "<" character, which should be a list-separator specification, we walked
+ off past the nul-terimation.
+
Exim version 4.91
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