Email system/External Links
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- Please sort and annotate in a user-friendly manner and consider archiving the URLs behind the links you provide. See also related web sources.
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
IANA Registries - Official registries for special domain names, reserved numbers, and protocol parameters.
Message Header Fields Multipurpose Internet Mail Extensions (MIME) Simple Mail Transfer Protocol (SMTP) Enhanced Status Codes Simple Mail Transfer Protocol (SMTP) Service Extensions