event id parameters of message tracking logs defined

 In exchange 2007, the admin needs to understand the important parameters of Message Tracking logs. Whereas Exchange Server 2003/2000's Message Tracking log was an easy-to-use application that shielded the user from this complexity, it also provided much less flexibility.
Message Tracking logs have a lot of details about a message as it originates from an internal user or external sender, and makes its way through the different stages of message routing and transfer, and finally gets delivered (or not). You can now track messages based on these events.
see below the event ids and descriptions. Proper understanding of these events will help for better troubleshooting and tracking of messages.
EventID Description
DEFER Message delivery delayed
DELIVER Message delivered to a mailbox
DSN A delivery status notification was generated.
Messages quarantined by the Content Filter are also delivered as DSNs. the recipients field has the SMTP address of the quarantine mailbox.
EXPAND Distribution Group expanded. The RelatedRecipientAddress field has the SMTP address of the Distribution Group.
FAIL Delivery failed. The RecipientStatus field has more information about the failure, including the SMTP response code. You should also look at the Source and Recipients fields when inspecting messages with this event.
POISONMESSAGE Message added to or removed from the poison queue
RECEIVE Message received. The Source field is STOREDRIVER for messages submitted by Store Driver (from a Mailbox server), or SMTP for messages
a) received from another Hub/Edge
b) received from an external (non-Exchange) host using SMTP
c) submitted by SMTP clients such as POP/IMAP users.
REDIRECT Message redirected to alternate recipient
RESOLVE Generally seen when a message is received on a proxy address and resolved to the default email address. The RelatedRecipientAddress field has the proxy address the message was sent to. The recipients field has the default address it was resolved (and delivered) to.
SEND Message sent by SMTP. The ServerIP and ServerHostName parameters have the IP address and hostname of the SMTP server.
SUBMIT The Microsoft Exchange Mail Submission service on a Mailbox server successfully notified a Hub Transport server that a message is awaiting submission (to the Hub). These are the events you'll see on a Mailbox server.
The SourceContext property provides the MDB Guid, Mailbox Guid, Event sequence number, Message class, Creation timestamp, and Client type. Client type can be User (Outlook MAPI), RPCHTTP (Outlook Anwhere), OWA, EWS, EAS, Assistants, Transport.
TRANSFER Message forked because of content conversion, recipient limits, or transport agents