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SMTP

Show me everything on Email Protocols

- SMTP (Simple Mail Transfer Protocol) is a TCP/IP protocol used in sending and receiving e-mail. However, since it is limited in its ability to queue messages at the receiving end, it is usually used with one of two other protocols, POP3 or IMAP, that let the user save messages in a server mailbox and download them periodically from the server. In other words, users typically use a program that uses SMTP for sending e-mail and either POP3 or IMAP for receiving e-mail. On Unix-based systems, sendmail is the most widely-used SMTP server for e-mail. A commercial package, Sendmail, includes a POP3 server. Microsoft Exchange includes an SMTP server and can also be set up to include POP3 support.

SMTP usually is implemented to operate over Internet port 25. An alternative to SMTP that is widely used in Europe is X.400. Many mail servers now support Extended Simple Mail Transfer Protocol (ESMTP), which allows multimedia files to be delivered as e-mail.

Getting started with SMTP

To explore how SMTP is used in the enterprise, here are some additional resources:

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 analyze Exchange Server SMTP log files in Microsoft Excel: Learn how to convert an Exchange SMTP log file into a text file and import it into Microsoft Excel, along with two approaches for evaluating those log files.

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 to use ISA Server as an SMTP filter: Learn how to direct your inbound SMTP traffic to an ISA Server to reduce the overall volume of SMTP mail that your Microsoft Exchange Server must process.

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.

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:	Joseph Mathew
LAST UPDATED:	28 Oct 2008

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More resources from around the web:

-	The SMTP specification is described in RFC 821.
-	Connected: An Overview offers an SMTP Protocol Overview .

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