Four ways for messages to enter the Transport Server

1. Through a receive connector
2. From the Pickup directory or the Replay directory
3. By direct placement in the submission queue by store driver
4. Through agent submission

Receive Connector submission

When your exchange 2007 accepts mail from Internet, the message is submitted through the Receive Connector.

Store Driver Submission

When OUTLOOK with Exchange server configuration sends mail, it goes to outgoing folder. The store driver retrieves it and submits it to the submission queue.

PICKUP and REPLAY

By default, Pickup and Replay directories are in the following directory.
c:\Program Files\Microsoft\Exchange Server\TransportRoles\

The Replay directory is used to resubmit exported Exchange messages and to receive messages from foreign gateway servers. These messages are already formatted for the Replay directory. There is little or no need for an administrator or other application to compose and submit new message files by using the Replay directory. The Pickup directory should be used to create and submit new message files.

EML file

Create an EML file

Set up e-mail account in Outlook Express or Windows Mail.

Open a message and save it as an eml file.

Copy the support.eml file to the pickup folder;

Exchange 2007 will deliver it. You could open the eml file and modify the TO: address according to your environment.

Create a simple eml file:

The following simple code composes the eml file, which can be put in PICKUP directory but not REPLAY directory.

From: "Kaiming Liao" <kaiming.liao@terrace.com>
To: "'Kaiming Liao'" <Kaiming@work.com>
Subject: Development status

Hello Team:

The last two at the bottom is what we are working with. Your participationand suggestion would be greatly appreciated.

Regards,

Put test.eml in PICKUP directory;

It is delivered.

Replay directory

The following simple code composes the eml file, which could be put in REPLAY directory for delivery.

X-Receiver: <kaiming@work.com>
X-Sender: <bob@contoso.com>
To: Rob.Prince@worker.com
From: bob@contoso.com
Subject: Optional message subject

The Replay directory receives messages from foreign gateway servers and resubmits messages that administrators export from the queues of Exchange 2007 servers.

Copy replay.eml to REPLAY directory;
It is delivered to Kaiming@work.com. However, when you open the message from outlook, it shows To:Rob.Prince@worker.com.

You can put the exported message from a failed transport server to a working transport server.export-message

An application could use the pickup directory to send e-mail.

Messages submitted by Agents.

A transport agent is a specific program, which does the specific tasks. For example:
                

C:\Program Files\Microsoft\Exchange Server\Scripts>.\install-AntispamAgents.ps1

Identity                                         Enabled         Priority
--------                                           -------         --------
Connection Filtering Agent        True            4
Content Filter Agent                    True            5
Sender Id Agent                            True            6
Sender Filter Agent                      True            7
Recipient Filter Agent                  True            8
Protocol Analysis Agent               True            9

All these agents can submit messages to the submission queue

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