[Exim] DSN (Deliver Status Notifications) in Exim?

Does Exim (more specifically Exim 4.32) support the logging of DSN's? (i.e.
550 user mailbox is full, etc).

I have logging turned all the way up - using the log_selector all option,
and mail.debug switch in syslogd.conf - but I don't see the various DSN
codes. How can this be accomplished, or can it?

I'm running FreeBSD 4.10 Release & Exim 4.32.