| IMAP | |
| RFC 3501 | Internet Message Access Protocol - version 4rev1 being updated by rfc3501-errata | 
| RFC 1730 | Internet Message Access Protocol - version 4 | 
| RFC 4314 | IMAP4 Access Control List (ACL) Extension | 
| RFC 2087 | IMAP4 QUOTA extension | 
| RFC 2088 | IMAP4 non-synchronizing literals | 
| RFC 2177 | IMAP4 IDLE command | 
| RFC 2192 | IMAP URL Scheme being updated by draft-ietf-lemonade-rfc2192bis | 
| RFC 2193 | IMAP4 Mailbox Referrals | 
| RFC 2342 | IMAP4 Namespace | 
| RFC 4315 | Internet Message Access Protocol (IMAP) - UIDPLUS extension | 
| RFC 2971 | IMAP4 ID extension | 
| RFC 3348 | IMAP4 Child Mailbox Extension | 
| RFC 3502 | IMAP MULTIAPPEND extension | 
| RFC 3516 | IMAP4 Binary Content Extension | 
| RFC 3691 | Internet Message Access Protocol (IMAP) UNSELECT command | 
| RFC 4466 | Collected Extensions to IMAP4 ABNF | 
| RFC 4467 | Internet Message Access Protocol (IMAP) - URLAUTH Extension | 
| RFC 4469 | Internet Message Access Protocol (IMAP) CATENATE Extension | 
| RFC 4550 | Internet Email to Support Diverse Service Environments (Lemonade) Profile | 
| RFC 4551 | IMAP Extension for Conditional STORE operation | 
| RFC 4731 | IMAP4 Extension to SEARCH Command for Controlling What Kind of Information Is Returned | 
| RFC 4959 | IMAP Extension for Simple Authentication and Security Layer (SASL) Initial Client Response | 
| RFC 4978 | The IMAP COMPRESS Extension | 
| RFC 5032 | WITHIN Search Extension to the IMAP Protocol | 
| RFC 5161 | The IMAP ENABLE Extension | 
| RFC 5162 | IMAP4 Extensions for Quick Mailbox Resynchronization | 
| RFC 5256 | Internet Message Access Protocol - SORT and THREAD Extensions | 
| RFC 5258 | Internet Message Access Protocol version 4 - LIST Command Extensions | 
| RFC 5524 | Extended URLFETCH for Binary and Converted Parts | 
| draft-daboo-imap-annotatemore | ANNOTATEMORE Draft | 
| RFC 5464 | The IMAP METADATA Extension | 
| draft-ietf-morg-list-specialuse | IMAP SPECIALUSE Draft (And non-standard Google XLIST support) | 
| RFC 5819 | IMAP4 Extension for Returning STATUS Information in Extended LIST | 
| RFC 5957 | Display-Based Address Sorting for the IMAP4 SORT Extension | 
| POP | |
| RFC 1939 | Post Office Protocol - Version 3 (POP3) | 
| RFC 2449 | POP3 Extension Mechanism | 
| RFC 2595 | Using TLS with IMAP, POP3 and ACAP | 
| RFC 5034 | The Post Office Protocol (POP3) Simple Authentication and Security Layer (SASL) Authentication Mechanism | 
| RFC 3206 | The SYS and AUTH POP Response Codes | 
| NNTP | |
| RFC 3977 | Network News Transfer Protocol (NNTP) | 
| RFC 4642 | Using Transport Layer Security (TLS) with Network News Transfer Protocol (NNTP) | 
| RFC 4643 | Network News Transfer Protocol (NNTP) Extension for Authentication | 
| RFC 4644 | Network News Transfer Protocol (NNTP) Extension for Streaming Feeds | 
| RFC 2980 | Common NNTP Extensions | 
| SASL | |
| RFC 4422 | Simple Authentication and Security Layer (SASL) | 
| RFC 4505 | Anonymous Simple Authentication and Security Layer (SASL) Mechanism | 
| RFC 4616 | The PLAIN Simple Authentication and Security Layer (SASL) Mechanism | 
| RFC 2195 | IMAP/POP AUTHorize Extension for Simple Challenge/Response being revised by draft-ietf-sasl-crammd5 | 
| RFC 2444 | The One-Time-Password SASL Mechanism | 
| RFC 2831 | Using Digest Authentication as a SASL Mechanism | 
| TLS/SSL | |
| RFC 4346 | The Transport Layer Security (TLS) Protocol Version 1.1 | 
| RFC 2246 | The TLS Protocol Version 1.0 | 
| draft-freier-ssl-version3 | The SSL Protocol Version 3.0 | 
| draft-hickman-netscape-ssl | The SSL Protocol Version 2.0 | 
| LMTP | |
| RFC 2033 | Local Mail Transfer Protocol | 
| RFC 5321 | Simple Mail Transfer Protocol | 
| RFC 1869 | SMTP Service Extensions | 
| RFC 1652 | SMTP Service Extension for 8bit-MIMEtransport | 
| RFC 1870 | SMTP Service Extension for Message Size Declaration | 
| RFC 2034 | SMTP Service Extension for Returning Enhanced Error Codes | 
| RFC 3463 | Enhanced Mail System Status Codes | 
| RFC 3207 | SMTP Service Extension for Secure SMTP over TLS | 
| RFC 4954 | SMTP Service Extension for Authentication | 
| RFC 2920 | SMTP Service Extension for Command Pipelining | 
| RFC 3848 | ESMTP and LMTP Transmission Types Registration | 
| draft-murchison-lmtp-ignorequota | LMTP Service Extension for Ignoring Recipient Quotas | 
| Sieve | |
| RFC 5228 | Sieve: A Mail Filtering Language | 
| RFC 5229 | Sieve Email Filtering: Variables Extension | 
| RFC 5230 | Sieve Email Filtering: Vacation Extension | 
| RFC 5231 | Sieve Email Filtering: Relational Extension | 
| RFC 5232 | Sieve Email Filtering: Imap4flags Extension | 
| RFC 5233 | Sieve Email Filtering: Subaddress Extension | 
| RFC 5260 | Sieve Email Filtering: Date and Index Extensions | 
| RFC 5173 | Sieve Email Filtering: Body Extension | 
| RFC 5490 | Sieve Email Filtering: Checking Mailbox Status and Accessing Mailbox Metadata | 
| RFC 3894 | Sieve Extension: Copying Without Side Effects | 
| RFC 2298 | Extensible Message Format for Message Disposition Notifications (MDNs) | 
| RFC 6131 | Sieve Vacation Extension: "Seconds" Parameter | 
| RFC 6609 | Sieve Email Filtering: Include Extension | 
| draft-ietf-sieve-regex | Sieve Email Filtering -- Regular Expression Extension | 
| draft-melnikov-sieve-imapflags | Sieve -- IMAP flag Extension | 
| draft-martin-sieve-notify | Sieve -- An extension for providing instant notifications | 
| draft-ietf-sieve-managesieve | A Protocol for Remotely Managing Sieve Scripts | 
| HTTP | |
| RFC 7230 | Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing | 
| RFC 7231 | Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content | 
| RFC 7232 | Hypertext Transfer Protocol (HTTP/1.1): Conditional Requests | 
| RFC 7233 | Hypertext Transfer Protocol (HTTP/1.1): Range Requests | 
| RFC 7234 | Hypertext Transfer Protocol (HTTP/1.1): Caching | 
| RFC 7235 | Hypertext Transfer Protocol (HTTP/1.1): Authentication | 
| RFC 7239 | Hypertext Transfer Protocol Version 2 (HTTP/2) | 
| RFC 7540 | Forwarded HTTP Extension | 
| RFC 7240 | Prefer Header for HTTP | 
| RFC 7694 | Hypertext Transfer Protocol (HTTP) Client-Initiated Content-Encoding | 
| RFC 7615 | HTTP Authentication-Info and Proxy-Authentication-Info Response Header Fields | 
| RFC 7616 | HTTP Digest Access Authentication | 
| RFC 7617 | The 'Basic' HTTP Authentication Scheme | 
| RFC 4559 | SPNEGO-based Kerberos and NTLM HTTP Authentication in Microsoft Windows | 
| [MS-NTHT] | NTLM Over HTTP Protocol Specification | 
| RFC 2817 | HTTP Upgrading to TLS Within HTTP/1.1 | 
| RFC 2818 | HTTP Over TLS | 
| RFC 6797 | HTTP Strict Transport Security (HSTS) | 
| RFC 4918 | HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV) | 
| RFC 3253 | Versioning Extensions to WebDAV (Web Distributed Authoring and Versioning) | 
| RFC 3744 | Web Distributed Authoring and Versioning (WebDAV) Access Control Protocol | 
| RFC 4331 | Quota and Size Properties for Distributed Authoring and Versioning (DAV) Collections | 
| RFC 5397 | WebDAV Current Principal Extension | 
| RFC 5689 | Extended MKCOL for Web Distributed Authoring and Versioning (WebDAV) | 
| RFC 5995 | Using POST to Add Members to Web Distributed Authoring and Versioning (WebDAV) Collections | 
| RFC 6578 | Collection Synchronization for Web Distributed Authoring and Versioning (WebDAV) | 
| RFC 4791 | Calendaring Extensions to WebDAV (CalDAV) | 
| RFC 6638 | Scheduling Extensions to CalDAV | 
| RFC 6352 | CardDAV: vCard Extensions to Web Distributed Authoring and Versioning (WebDAV) | 
| RFC 6764 | Locating Services for Calendaring Extensions to WebDAV (CalDAV) and vCard Extensions to WebDAV (CardDAV) | 
| RFC 7808 | Time Zone Data Distribution Service | 
| RFC 7809 | CalDAV: Time Zones by Reference | 
| RFC 7953 | Calendar Availability | 
| draft-york-vpoll | VPOLL: Consensus Scheduling Component for iCalendar | 
| draft-desruisseaux-ischedule | Internet Calendar Scheduling Protocol (iSchedule) | 
| draft-thomson-hybi-http-timeout | Hypertext Transfer Protocol (HTTP) Keep-Alive Header | 
| draft-murchison-webdav-prefer | Use of the Prefer Header Field in Web Distributed Authoring and Versioning (WebDAV) | 
| caldav-ctag | Calendar Collection Entity Tag (CTag) in CalDAV | 
| Brief Header | Microsoft 'Brief' header extension | 
| Other | |
| RFC 3656 | MUPDATE Protocol (For Cyrus Murder) | 
| RFC 5322 | Internet Message Format | 
| RFC 5536 | Netnews Article Format | 
| RFC 5537 | Netnews Architecture and Protocols | 
| RFC 5423 | Internet Message Store Events | 
| RFC 4287 | The Atom Syndication Format | 
| RFC 5545 | Internet Calendaring and Scheduling Core Object Specification (iCalendar) | 
| RFC 5546 | iCalendar Transport-Independent Interoperability Protocol (iTIP) | 
| RFC 6047 | iCalendar Message-Based Interoperability Protocol (iMIP) | 
| RFC 7529 | Non-Gregorian Recurrence Rules in iCalendar | 
| RFC 6231 | xCal: The XML Format for iCalendar | 
| RFC 7265 | jCal: The JSON Format for iCalendar | 
| RFC 6350 | vCard Format Specification | 
| RFC 6376 | DomainKeys Identified Mail (DKIM) Signatures |