RFC 2505:Anti-Spam Recommendations for SMTP MTAs
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Anti-Spam Recommendations for SMTP MTAs
1. Introduction
1.1. Background
1.2. Scope
1.3. Terminology
1.4. Using DNS information
1.5. Where to block spam, in SMTP, in RFC822 or in the UA
1.6. SMTP Return Codes
1.7. Mailing Lists
2. Recommendations
2.1. Restricting unauthorized Mail Relay usage
2.2. Received: lines
2.2.1. Direct MTA-to-MTA connections
2.2.2. Firewall/gateway type devices
2.3. Event logs
2.4. Log anti-relay/anti-spam actions
2.5. Refuse mail based on SMTP_Caller address
2.6. "MAIL From: <>" and "MAIL From: <user@my.local.dom.ain>"
2.6.1. "MAIL From: <>"
2.6.2. "MAIL From: <user@my.local.dom.ain>"
2.7. Refuse based on "MAIL From:"
2.8. Rate Control
2.9. Verify "MAIL From:"
2.10. Verify <local-part>
2.11. SMTP VRFY and EXPN
2.12. SMTP ETRN
2.13. Return Codes
2.13.1. The importance of flexibility - an example
3. Future work
3.1. Impact on SMTP UAs and end users
3.2. Personal anti-spam filters
3.3. SMTP Authentication
3.4. Spam and NATs
4. Security Considerations
5. Acknowledgements
6. References
7. Editor's Address
8. Full Copyright Statement
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