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At one time, the designers of X.400 were expecting it to be the predominant form of email, but this role has been taken by the SMTP-based Internet e-mail. [1] Despite this, it has been widely used within organizations and was a core part of Microsoft Exchange Server until 2006; variants continue to be important in military and aviation contexts.
Microsoft had sold a number of simpler email products before, but the first release of Exchange (Exchange Server 4.0 in April 1996 [1]) was an entirely new X.400-based client–server groupware system with a single database store, which also supported X.500 directory services.
In Microsoft Exchange Server, the messages, the calendar, and other data items are delivered to and stored on the server. Microsoft Outlook stores these items in a personal-storage-table (.pst) or off-line-storage-table (.ost) files that are located on the local computer. Most commonly, the .pst files are used to store archived items and the ...
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Intelligent Message Filter: Initially a free Microsoft add-on, later, part of service pack 2, that uses heuristic message analysis to block messages or direct them to the "Junk E-Mail" folder in Microsoft Outlook clients. [10] It is included with both Windows Small Business Server 2003 Standard and Premium editions.
The message exceeds the size limit. The message expires because it reached the TTL (time to live) [4] The message is rejected by another queue exchange. [5] The message has been read and rejected too many times. [6] Routing these messages to a dead letter queue enables analysis of common fault patterns and potential software problems. [7]
If you've received a notification that a limit has been met, you'll need to wait a set amount of time before you can send more emails. Most sending limit notifications inform you of how long you'll have to wait. If you're planning to regularly send bulk email, consider looking into alternate solution.
C: This is a test message with 5 header fields and 4 lines in the message body. C: Your friend, C: Bob C: . S: 250 Ok: queued as 12345 C: QUIT S: 221 Bye {The server closes the connection} And below is an example of an SMTP connection in which the SMTP Server supports the Enhanced Status Code, taken from RFC 2034: