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<?xml version="1.0" encoding="gb2312"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312"/><title>SMTP turbolinux </title></head><body><center><h1>BBS 水木清華站∶精華區(qū)</h1></center><a name="top"></a>發(fā)信人: hellow (收復臺灣是我心), 信區(qū): Embedded <br />標 題: SMTP <br />發(fā)信站: BBS 水木清華站 (Sun Nov 5 09:47:17 2000) <br /> <br /> <br /> RFC 821 <br /> <br /> <br /> <br /> <br /> <br /> SIMPLE MAIL TRANSFER PROTOCOL <br /> <br /> <br /> <br /> Jonathan B. Postel <br /> August 1982 <br /> <br /> <br /> <br /> Information Sciences Institute <br /> University of Southern California <br /> 4676 Admiralty Way <br /> Marina del Rey, California 90291 <br /> (213) 822-1511 <br /> <br /> <br /> <br />RFC 821 August 1982 <br /> Simple Mail Transfer Protocol <br /> TABLE OF CONTENTS <br /> 1. INTRODUCTION .................................................. 1 <br /> 2. THE SMTP MODEL ................................................ 2 <br /> 3. THE SMTP PROCEDURE ............................................ 4 <br /> 3.1. Mail ..................................................... 4 <br /> 3.2. Forwarding ............................................... 7 <br /> 3.3. Verifying and Expanding .................................. 8 <br /> 3.4. Sending and Mailing ..................................... 11 <br /> 3.5. Opening and Closing ..................................... 13 <br /> 3.6. Relaying ................................................ 14 <br /> 3.7. Domains ................................................. 17 <br /> 3.8. Changing Roles .......................................... 18 <br /> 4. THE SMTP SPECIFICATIONS ...................................... 19 <br /> 4.1. SMTP Commands ........................................... 19 <br /> 4.1.1. Command Semantics ..................................... 19 <br /> 4.1.2. Command Syntax ........................................ 27 <br /> 4.2. SMTP Replies ............................................ 34 <br /> 4.2.1. Reply Codes by Function Group ......................... 35 <br /> 4.2.2. Reply Codes in Numeric Order .......................... 36 <br /> 4.3. Sequencing of Commands and Replies ...................... 37 <br /> 4.4. State Diagrams .......................................... 39 <br /> 4.5. Details ................................................. 41 <br /> 4.5.1. Minimum Implementation ................................ 41 <br /> 4.5.2. Transparency .......................................... 41 <br /> 4.5.3. Sizes ................................................. 42 <br /> APPENDIX A: TCP ................................................. 44 <br /> APPENDIX B: NCP ................................................. 45 <br /> APPENDIX C: NITS ................................................ 46 <br /> APPENDIX D: X.25 ................................................ 47 <br /> APPENDIX E: Theory of Reply Codes ............................... 48 <br /> APPENDIX F: Scenarios ........................................... 51 <br /> GLOSSARY ......................................................... 64 <br /> REFERENCES ....................................................... 67 <br /> <br /> <br />Network Working Group J. Postel <br />Request for Comments: DRAFT ISI <br />Replaces: RFC 788, 780, 772 August 1982 <br /> SIMPLE MAIL TRANSFER PROTOCOL <br />1. INTRODUCTION <br /> The objective of Simple Mail Transfer Protocol (SMTP) is to transfer <br /> mail reliably and efficiently. <br /> SMTP is independent of the particular transmission subsystem and <br /> requires only a reliable ordered data stream channel. Appendices A, <br /> B, C, and D describe the use of SMTP with various transport services. <br /> A Glossary provides the definitions of terms as used in this <br /> document. <br /> An important feature of SMTP is its capability to relay mail across <br /> transport service environments. A transport service provides an <br />
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