Exchange server 2007 message flow

Message transport components:

Submission queue: stores all messages on disk awaiting processing

Store driver: received messages from outbox, when ever we send mails they are stored in outbox

Ms Exchange mail submission service

Runs on mail box server

Notifies hub transport when MSG is ready to be retrieved from senders outbox

Stores driver picks up the message

Pick up directory

Submits messages to submission queue

Categorizer:

Process messages from submission queue

Handles messages with multiple recipients

Determines routing path

Applies organization message policies

Message flow from outside the organization:

Enters via SMTP receive connector

Edge server or hub server

Message is dropped into submission queue

Message flow from with in organization

Enter via SMTP receive connector

Hub transport server

Pickup directory

Store driver dropping then into the submission queue