bug: a transport crash, where a dangling pointer for $sending_ip_address
originally assigned in a verify callout, is re-used.
+JH/17 Rework error string handling in TLS interface so that the caller in
+ more cases is responsible for logging. This permits library-sourced
+ string to be attached to addresses during delivery, and collapses
+ pairs of long lines into single ones.
+
Exim version 4.88
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