it only wrote the new authenticators, resulting in a lack of tracking of
peer changes of ESMTP extensions until the next cache flush.
+JH/41 Fix the loop reading a message header line to check for integer overflow,
+ and more-often against header_maxsize. Previously a crafted message could
+ induce a crash of the recive process; now the message is cleanly rejected.
+
Exim version 4.91
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