are not useable for FD_SET() [and hence select()] and overwrite the stack.
Assorted crashes happen.
+JH/11 Fix use of $sender_host_name in daemon process. When used in certain
+ main-section options or in a connect ACL, the value from the first ever
+ connection was never replaced for subsequent connections. Found by
+ Wakko Warner.
+
Exim version 4.95
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