which naturally failed, giving a failed delivery and bloating the retry
database. Investigation and fix prototype from Wolfgang Breyha.
+JH/12 Fix check on SMTP command input synchronisation. Previously there were
+ false-negatives in the check that the sender had not preempted a response
+ or prompt from Exim (running as a server), due to that code's lack of
+ awareness of the SMTP input buferring.
+
Exim version 4.89
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