AOL FBL and finding the relevant subscriber

AOL's Feed Back Loop redacts the aol email id, even redacting the X-Subscriber header. So, we've to dig through the mail server logs to find the subscriber. First we have to find the message id which the mail server reports -

Received: by krishna.radiosai.org (Postfix, from userid 33) id [11 char alphanumeric id]

and use that id for

cat /var/log/mail.log | grep [11 char alphanumeric id]
or
cat /var/log/mail.log.0 | grep [11 char alphanumeric id]