Email相關的RFC參考

RFC 821 - Simple Mail Transfer Protocol 簡易郵件傳輸通訊協定(SMTP)
RFC 822 - Standard For The Format Of ARPA Internet Text Messages ARPA 互連網文本資訊格式(信頭格式) Obsoleted by RFC 2822
RFC 974 - Mail Routing And The Domain System 郵件路由和域系統(MX路由)
RFC 976 - UUCP Mail Interchange Format Standard UUCP郵件交換格式  
RFC 1123 - Requirements for Internet Hosts -- Application and Support 互連網主機需求
RFC 1321 - The MD5 Message-Digest Algorithm
RFC 1344 - MIME對互連網郵件網關的意義
RFC 1413 - 鑒別協議(ident)
RFC 1652 - SMTP Service Extension for 8bit-MIMEtransport 8位元-MIME-SMTP服務擴充
RFC 1842 - ASCII Printable Characters-Based Chinese Character Encoding
RFC 1869 - SMTP Service Extensions SMTP服務擴充(ESMTP規格)
RFC 1870 - 資訊大小通報的SMTP服務擴充
RFC 1891 - 發送狀態通知的SMTP服務擴充
RFC 1892 - The Multipart/Report Content Type for the Reporting of Mail System 用於報告郵件系統管理資訊的多部分/報告內容類型
RFC 1893 - Enhanced Mail System Status Codes 增強型郵件系統狀態代碼。
RFC 1894 - An Extensible Message Format for Delivery Status Notifications 發送狀態通知的可擴充資訊格式
RFC 1939 - Post Office Protocol - Version 3 郵件協議-版本3(POP3) Updated by RFC 2449
RFC 1957 - Some Observations on Implementations of the Post Office Protocol (POP3)
RFC 1985 - 遠程資訊列隊啟動SMTP服務擴充
RFC 2033 - 本地郵件傳輸協議(LMTP)
RFC 2034 - smtp的增強錯誤碼
RFC 2045 - MIME Part One: Format of Internet Message Bodies 多用途互連網郵件擴充(MIME)第一部分：互連網資訊本文格式 Updated by RFC 2231
RFC 2046 - MIME Part Two: Media Types     MIME 第二部分：媒介類型
RFC 2047 - MIME Part Three: Message Header Extensions for Non-ASCII Text MIME 第三部分：非ASCII文本資訊頭擴充 Updated by RFC 2231
RFC 2048 - MIME 第四部分：註冊過程
RFC 2049 - 一致性標準和樣本
RFC 2060 - 互連網資訊訪問協議-版本4修訂本(IMAPrev1)
RFC 2066 - IMAP4 ACL 擴充
RFC 2067 - IMAP4 配置擴充
RFC 2068 - IMAP4 非同步字(LITERAL+)
RFC 2095 - IMAP/POP簡單挑戰/回應認證擴充(CRAM+MD5)
RFC 2183 - The Content-Disposition Header Field     Updated by RFC 2231
RFC 2195 - IMAP/POP AUTHorize Extension for Simple Challenge/Response
RFC 2197 - SMTP Service Extension for Command Pipelining
RFC 2202 - Test Cases for HMAC-MD5 and HMAC-SHA-1
RFC 2111 - Content-ID and Message-ID Uniform Resource Locators     
RFC 2222 - Simple Authentication and Security Layer (SASL) 簡單認證和安全層(SASL)
RFC 2231 - MIME Parameter Value and Encoded Word Extensions: Character Sets,...
RFC 2246 - TLS POP
RFC 2251 - 輕量目錄訪問協議(LDAP)版本3
RFC 2342 - IMAP4 命名空間
RFC 2359 - IMAP4 UIDPLUS擴充
RFC 2387 - The MIME Multipart/Related Content-type
RFC 2449 - POP3 Extension Mechanism  POP3擴充機制
RFC 2476 - 資訊提交代理(MSA)
RFC 2487 - TLS上安全SMTP的SMTP服務擴充
RFC 2505 - SMTP MTAs垃圾資訊建議
RFC 2553 - 用於IPv6的基本套介面擴充
RFC 2554 - SMTP Service Extension for Authentication
RFC 2632 - S/MIME Version 3 Certificate Handling     
RFC 2633 - S/MIME Version 3 Message Specification
RFC 2821 - Simple Mail Transfer Protocol         
RFC 2822 - Internet Message Format     
RFC 2831 - Using Digest Authentication as a SASL Mechanism
RFC 3462 - The MIME Multipart/Report Content-type
RFC 3463 -  Enhanced Mail System Status Codes
RFC 4406 - Sender ID: Authenticating E-Mail
RFC 4408 - Sender Policy Framework (SPF) for Authorizing Use of
RFC 4408 - Domain-Based Email Authentication Using Public Keys Advertised in the DNS (DomainKeys)
RFC 4871 - DomainKeys Identified Mail (DKIM) Signatures    
RFC 5617 - DKIM Author Domain Signing Practices (ADSP)