Welcome to Microsoft SMTP Service

Microsoft® SMTP Service uses the standard Internet protocol Simple Mail Transfer Protocol (SMTP) to transport and deliver messages based on specifications in Request for Comments (RFC) 821 and RFC 822. It also includes enhancements that build upon the basic delivery functions of the protocol. There are options available that give you control over the routing and delivery of messages, and that provide secure communications.

Designed for high scalability, reliability, and performance, Microsoft SMTP Service supports hundreds of client connections in a single-server configuration. You can use Microsoft SMTP Service independently or with other Microsoft® Internet Information Server (IIS) version 4.0 products that share common setup, administration, and operation tools.

This documentation contains:

• Introduction to Microsoft SMTP Service: Overview of Microsoft SMTP Service components and functionality.
  
• Operating Microsoft SMTP Service: Instructions for configuring and operating Microsoft SMTP Service.
  
• Maintenance for Microsoft SMTP Service: Instructions for monitoring Microsoft SMTP Service performance.
  
• Troubleshooting Microsoft SMTP Service: Instructions for resolving common operating problems.
  
• Microsoft SMTP Service Reference Guide: Detailed description of events, performance counters, and registry settings.

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