How To Read IIS6's Smtp Logs

i need to parse smtp logs to check the delivery status. from previous experience with smtp logs, i was under the impression that the log file followed a very specific format:

EHLO
MAIL
RCPT
BDAT
QUIT

in this case, however, i've got a log indicating commands being issued like this:

EHLO
EHLO
MAIL
MAIL
RCPT
RCPT
BDAT
BDAT
QUIT
QUIT

i have a separate list from a database of people i attempted to send emails to and need to try to look at each line in the smtp logs until i find a matching email address, then continue to read until i find a line that includes the string "+Queued+mail+for+delivery" or any of the other strings indicating the delivery status. however, given the odd sequence in which the mail commands are being issued, i don't seem to have any way of knowing if the delivery status notification line i'm reading really reflects delivery status info about the email address in question or if it's referring to one of the other delivery requests issued with another one of the EHLO commands. i've tried looking to see if there's something unique about the delivery status line to see if it's in some way associated with the RCPT line, but don't see any patterns:

2005-10-05 11:12:30 10.1.208.103 OutboundConnectionCommand SMTPSVC1 ACME -
25 RCPT - TO:<person@acme2.com> 0 0 4 0 50 - - ......