On Sun, 2007-01-21 at 10:37 -0500, My BSD wrote:

Deliver's log entries do not include a date and time:

"deliver([username]): Info: auth input: [username]"

Fixed: http://dovecot.org/list/dovecot-cvs/2007-January/007474.html

You can also uncomment log_timestamp from dovecot.conf to make it work.