Email processes and protocols/External Links

From IETF (Internet Engineering Task Force)
Best Current Practices (BCPs) - IETF's best recommendations, going beyond the standards.

BCP30 - Anti-Spam Recommendations for SMTP MTAs BCP38 - Defeating Denial of Service Attacks BCP46 - Recommended ISP Security Proceedures BCP134 - Email Submission Operations: Access and Accountability Requirements

From IANA (Internet Assigned Numbers Authority)
IANA Registries - up-to-date, official registries for names, numbers, and protocol parameters, including additions approved after the original publications.

IANA Protocol Registries Message Header Fields Multipurpose Internet Mail Extensions (MIME) Simple Mail Transfer Protocol (SMTP) Enhanced Status Codes Simple Mail Transfer Protocol (SMTP) Service Extensions - - -  17 other registries related to email - - -