RFC 3207 SMTP Service Extension for Secure SMTP over Transport Layer Security
RFC 2920 SMTP Service Extension for Command Pipelining
RFC 2821 Simple Mail Transfer Protocol
RFC 2554 SMTP Service Extension for Authentication
RFC 2505 Anti-Spam Recommendations for SMTP MTAs
RFC 2487 SMTP Service Extension for Secure SMTP over TLS
RFC 2034 SMTP Service Extension for Returning Enhanced Error Codes
RFC 1985 SMTP Service Extension for Remote Message Queue Starting
RFC 1891 SMTP Service Extension for Delivery Status Notifications
RFC 1870 SMTP Service Extension for Message Size Declaration
RFC 1869 SMTP Service Extensions
RFC 1652 SMTP Service Extension for 8bit-MIME transport
RFC 2595 Using TLS with IMAP, POP3 and ACAP
RFC 2449 POP3 Extension Mechanism
RFC 2195 IMAP/POP AUTHorize Extension for Simple Challenge/Response
RFC 1939 Post Office Protocol - Version 3
RFC 2683 IMAP4 Implementation Recommendations
RFC 2595 Using TLS with IMAP, POP3 and ACAP
RFC 2359 IMAP4 UIDPLUS extension
RFC 2342 IMAP4 Namespace
RFC 2195 IMAP/POP AUTHorize Extension for Simple Challenge/Response
RFC 2180 IMAP4 Multi-Accessed Mailbox Practice
RFC 2177 IMAP4 IDLE command
RFC 2087 IMAP4 QUOTA extension
RFC 2086 IMAP4 ACL extension
RFC 2060 Internet Message Access Protocol - Version 4rev1