RFC 821

Network Working Group
Request for Comments: 821
Replaces: RFC 788, 780, 772

J. Postel
ISI
August 1982

Table of Contents

• 1. INTRODUCTION
• 2. THE SMTP MODEL
• 3. THE SMTP PROCEDURES
  • 3.1. MAIL
  • 3.2. FORWARDING
  • 3.3. VERIFYING AND EXPANDING
  • 3.4. SENDING AND MAILING
  • 3.5. OPENING AND CLOSING
  • 3.6. RELAYING
  • 3.7. DOMAINS
  • 3.8. CHANGING ROLES
• 4. THE SMTP SPECIFICATIONS
  • 4.1. SMTP COMMANDS
    • 4.1.1. COMMAND SEMANTICS
    • 4.1.2. COMMAND SYNTAX
  • 4.2. SMTP REPLIES
    • 4.2.1. REPLY CODES BY FUNCTION GROUPS
    • 4.2.2. NUMERIC ORDER LIST OF REPLY CODES
  • 4.3. SEQUENCING OF COMMANDS AND REPLIES
  • 4.4. STATE DIAGRAMS
  • 4.5. DETAILS
    • 4.5.1. MINIMUM IMPLEMENTATION
    • 4.5.2. TRANSPARENCY
    • 4.5.3. SIZES
• APPENDIX A: TCP Transport service
• APPENDIX B: NCP Transport service
• APPENDIX C: NITS
• APPENDIX D: X.25 Transport service
• APPENDIX E: Theory of Reply Codes
• APPENDIX F: Scenarios
  • A Typical SMTP Transaction Scenario
  • Aborted SMTP Transaction Scenario
  • Relayed Mail Scenario
  • Verifying and Sending Scenario
  • Sending and Mailing Scenarios
  • Mailing List Scenario
  • Forwarding Scenarios
  • Too Many Recipients Scenario
• GLOSSARY
• REFERENCES

• Original text document
• Complete HTML RFC (TAR, TGZ, or ZIP format)

Dies ist ein Mirror von Connected: An Internet Encyclopedia von Brent Baccala. Die offizielle Projekt-Homepage findet sich im Web unter www.freesoft.org/CIE. Dieser Mirror wurde zuletzt aktualisiert am Samstag, 28 Januar 2006 18:18 +0100.