+Since version 4.98
+------------------
+
+JH/01 Use fewer forks & execs for sending many messages to a single host.
+ By passing back the next message-id from the transport to the delivery
+ process, we can loop there. A two-phase queue run will benefit,
+ particularly for mailinglist and smarthost cases.
+
+JH/02 Add transaction support for hintsdbs. The sole initial provider is
+ sqlite, and is used for the wait-transport and retry DBs. Transactions
+ imply locking internal to the DB. We no longer need a separate lockfile,
+ can keep the DB handle open for extended periods, yet potentially benefit
+ from concurrency on non-conflicting record uses.
+