found indication; now we go on to read the "scan ok" response line,
and send a quit.
-JH/18 Convert macro handling to be tree-based, from the previous linear list.
- With the number of builtin macros we now have this is worthwhile,
- dropping the config-file read time (during which new macros are checked
- and registered, and macros are expanded) from about 500 usec to about 180.
+JH/18 Bug 2239: Enforce non-usability of control=utf8_downconvert in the mail
+ ACL. Previously, a crash would result.
Exim version 4.90