to DSN fail messages (bounces): remote IP, remote greeting, remote response
to HELO, local diagnostic string.
+JH/05 Downgrade message for a TLS-certificate-based authentication fail from
+ log line to debug. Even when configured with a tls authenticator many
+ client connections are expected to not authenticate in this way, so
+ an authenticate fail is not an error.
+
Exim version 4.86
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