[Dovecot] Dovecot LDA failure in RC16

[Steven F Siirila]

After upgrading a test server from rc15 to rc16, Postfix was no longer able
to deliver mail via Dovecot deliver:

Jan  5 11:00:59 testhost postfix/local[8873]: 497282EFE: to=<testuser at testhost>, relay=local, delay=1.2, delays=0.13/0.02/0/1, dsn=5.3.0, status=bounced (Command died with status 89: "/opt/dovecot/libexec/dovecot/deliver -f "$SENDER"")

Should "status 89" mean something to me?
How can I debug this?

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