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Simple Mail Transfer Protocol (RFC0788)

IP.com Disclosure Number: IPCOM000003837D
Original Publication Date: 1981-Nov-01
Included in the Prior Art Database: 2019-Feb-14
Document File: 64 page(s) / 63K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. Postel: AUTHOR

Related Documents

10.17487/RFC0788: DOI

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 5% of the total text.

RFC788

SIMPLE MAIL TRANSFER PROTOCOL Jonathan B. Postel

November 1981 Information Sciences Institute University of Southern California 4676 Admiralty Way Marina del Rey, California 90291

(213) 822-1511

RFC 788 November 1981 Simple Mail Transfer Protocol

TABLE OF CONTENTS

1. INTRODUCTION .................................................. 1

2. THE SMTP MODEL ................................................ 2

3. THE SMTP PROCEDURE ............................................ 4

3.1. Mail ..................................................... 4 3.2. Forwarding ............................................... 7 3.3. Verifying and Expanding .................................. 8 3.4. Sending and Mailing ..................................... 10 3.5. Opening and Closing ..................................... 12 3.6. Relaying ................................................ 13 3.7. Domains ................................................. 15

4. THE SMTP SPECIFICATIONS ...................................... 16

4.1. SMTP Commands ........................................... 16 4.1.1. Command Semantics ..................................... 16 4.1.2. Command Syntax ........................................ 23 4.2. SMTP Replies ............................................ 28 4.2.1. Reply Codes by Function Group ......................... 29 4.2.2. Reply Codes in Numeric Order .......................... 30 4.3. Sequencing of Commands and Replies ...................... 31 4.4. State Diagrams .......................................... 33 4.5. Details ................................................. 35 4.5.1. Minimum Implementation ................................ 35 4.5.2. Transparency .......................................... 35 4.5.3. Sizes ................................................. 36

APPENDIX A: TCP ................................................. 38 APPENDIX B: NCP ................................................. 39 APPENDIX C: NITS ................................................ 40 APPENDIX D: X.25 ................................................ 41 APPENDIX E: Theory of Reply Codes ............................... 42 APPENDIX F: Scenarios ........................................... 45

GLOSSARY ......................................................... 58

REFERENCES ....................................................... 61

Network Working Group J. Postel Request for Comments: 788 ISI Replaces: RFC 780, 772 November 1981

SIMPLE MAIL TRANSFER PROTOCOL

1. INTRODUCTION

The objective of Simple Mail Transfer Protocol (SMTP) is to transfer mail reliably and efficiently.

SMTP is independent of the particular transmission subsystem and requires only a reliable ordered data stream channel. Appendices A, B, C, and D describe the use of SMTP with various transport services. A Glossary provides the definitions of terms as used in this document.

An important feature of SMTP is its capability to relay mail across transport service environments. A transport service p...

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