vb.net create barcode image Routing and Transport in C#

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ChapTEr 5
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Routing and Transport
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The Pickup directory is used to support legacy applications that are not capable of sending messages using MAPI or SMTP protocol but instead by using a simple text file (extension .eml) that is stored in the Pickup directory. The text file has to include a certain formatting so that Exchange can compose a message out of the text file and sent it. The following requirements must be met:
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The message file must be a text file that complies with the basic SMTP message format. MIME message header fields and content are supported. Only one e-mail address can exist in the Sender field. Multiple e-mail addresses aren't allowed. At least one e-mail address must exist in the To, Cc, or Bcc fields. A blank line must exist between the message header and the message body.
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The following is an example of a valid message that can be processed by the Pickup directory:
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To: Joel@litware.com From: Sigi@fabrikam.com Subject: Pickup Directory Test Hi! This is a Pickup Directory Test Sigi
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The pickup process is quite simple: you store a message as a <message>.eml file in the directory, the Pickup directory is checked every five seconds (this cannot be changed), and then .eml files will be processed. The processing of messages in the pickup directory always follows the same scheme:
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Rename <message>.eml to <message>.tmp. (If the file exists, the date and time are added to the name as well.) If the <message>.eml did not include the required formatting, the file is renamed to <message>.bad. After the message is successfully queued for delivery, a close command is issued, and the .tmp file is deleted from the Pickup directory.
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If the Microsoft Exchange Transport service is restarted when there are .tmp
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Note
files in the pickup or replay directories, all .tmp files are renamed as .eml files and are reprocessed. This could lead to duplicate message transmission.
Exchange Transport Server Architecture
ChapTEr 5
Message Queues on Transport Servers
Every message that is sent between Transport servers is temporary stored on the Transport server in a place called a message queue. In this location, the message waits for the next step in processing. As explained in Table 5-1, six different message queues are available on a Transport server. You will find more details on the specific queues later in this chapter.
TABLE 5-1 Message Queues in Exchange 2010
QUEUE NAME
DESCRIPTION
Mailbox delivery queue (or MAPI delivery) Remote delivery queue
Delivers messages to mailbox databases located in the same Active Directory site. One queue is available per database. This queue only exists on Hub Transport servers. On Hub Transports, delivers messages to a Hub Transport server in a remote Active Directory site. On Edge Transport servers, delivers messages to remote SMTP domains. Stores messages that are then processed by the categorizer for further delivery. Copies of messages that are sent to a remote Hub Transport that did not yet report successful delivery of the message are stored here. Stores isolated messages that are detected to be potentially harmful to the Exchange 2010 system. Contains messages that can t be routed to their destinations, most likely because of Active Directory replication latency or other configuration issues.
Submission queue Shadow redundancy queue
Poison message queue Unreachable queue
Exchange 2010 stores all queues in the queue database, which is described in the next section. The queues itself can be managed using either the Queue Viewer or using the Get-Queue cmdlet, as shown in Figure 5-2.
FIGURE 5-2 Viewing messages queues using the Get-Queue cmdlet
ChapTEr 5
Routing and Transport
Queue Database
All message queues are stored in a single database called a queue database. The queue database is based on the Extensible Storage Engine (ESE) database technology, which is also used by the Mailbox Server. The queue database is made up of a database file and several log files to record transactions. The checkpoint file tracks which transaction log files have been committed to the database. During a service shutdown of the Microsoft Exchange Transport service, all transaction log files are always committed to the database. The queue database uses circular logging, which means that the history of committed transactions that are stored in the transaction log files is not maintained. Any transaction log file older than the current checkpoint is immediately and automatically deleted and thus cannot be used to replay queue database recovery.
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