redis_servers = needs to be configured which will be used by the redis
lookup. Patch from Warren Baker, of The Packet Hub.
+TL/15 Fix exiqsumm summary for corner case. Patch provided by Richard Hall.
+
+TL/16 Bugzilla 1289 - Clarify host/ip processing when have errors looking up a
+ hostname or reverse DNS when processing a host list. Used suggestions
+ from multiple comments on this bug.
Exim version 4.80.1