MAPI
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MAPI


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DEFINITION - MAPI (Messaging Application Program Interface) is a Microsoft Windows program interface that enables you to send e-mail from within a Windows application and attach the document you are working on to the e-mail note. Applications that take advantage of MAPI include word processors, spreadsheets, and graphics applications. MAPI-compatible applications typically include a Send Mail or Send in the File pulldown menu of the application. Selecting one of these sends a request to a MAPI server.

MAPI consists of a standard set of C language functions that are stored in a program library known as a dynamic link library (DLL). Developers who are using Microsoft's Active Server Page (ASP) technology access the MAPI library by using Microsoft's Collaboration Data Objects (CDO). The CDO library comes with Microsoft's Internet Information Server (IIS). MAPI functions can be accessed by Visual Basic developers through a Basic-to-C translation layer.

Eudora, one of the most popular e-mail programs, includes a MAPI server. To activate the Eudora MAPI server, select Options from the Tools pulldown menu and then double-click on MAPI and specify whether MAPI should always be active or whether it should be active only when Eudora is running. Microsoft Exchange and possibly some other programs may require that you turn the MAPI server off when they are in use.

Learn more about Email Protocols
Enabling protocol logging for Exchange Server: Protocol logging lets you see the commands that clients are sending to Exchange so you can detect suspicious traffic patterns. Protocol logs are also an excellent forensic tool.
A primer on messaging standards: SMTP, POP and IMAP: A brief introduction to three of Exchange's more commonly used messaging standards: SMTP, POP and IMAP.
Improve Exchange 2003 Internet connectivity, mail flow and performance: Learn how to configure SMTP virtual servers, connectors, bridgeheads and routing groups to improve Exchange 2003 Web connectivity and email performance.
A primer on SMTP and ESMTP servers and commands: Learn about Simple Message Transfer Protocol (SMTP) and Extended SMTP (ESMTP), common commands and how each protocol works.
How to use SMTP queues to troubleshoot mail flow: Find out how you can use SMTP queues to diagnose and troubleshoot Exchange Server mail flow and email performance issues.
How Exchange Server performs Active Directory LDAP queries: Exchange MVP Brien Posey describes the three services Exchange Server uses to perform Active Directory LDAP queries: DSAccess, DSProxy and the SMTP categorizer.
How to analyze Exchange Server SMTP log files in Microsoft Excel: Exchange MVP Brien Posey explains two approaches for analyzing your Exchange Server SMTP log files in Microsoft Excel to determine bandwidth consumption.

CONTRIBUTORS: Maureen Bonnes
LAST UPDATED: 05 Feb 2004

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More resources from around the web:
- Microsoft's TechNet site provides help for developers who are using MAPI.
- Eudora's MAPI Frequently Asked Questions includes a brief general description of MAPI in addition to information about how Eudora uses it.





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