What's new in the Email WorldIMAP/LEMONADE/SIEVE(no DKIM or EAI)
Alexey Melnikov
<alexey.melnikov@isode.com>
IMAPEXT WG
IMAP is message access protocol, designedto make clients easier
Tasked to produce extensions to IMAP (RFC3501), such as:
●Sorting, threading, and viewing
●Access Control Lists
●Message-level annotations
●I18N
IMAP building blocks to build cool toys
LEMONADE WG
●Lemonade is tasked to provide a set of enhancements andprofiles of Internet email submission, transport, andretrieval protocols to facilitate operation on platforms withconstrained resources, or communications links with highlatency or limited bandwidth.
●Lemonade Profile recently published (RFC 4550)
Forward-without-download
Push Email (IMAP IDLE)
Quick Flag Changes Resynchronization(CONDSTORE)
Reduction of bandwith/round-trips
[Soon to be] completed work inIMAPEXT WG
●April 2006 - Collected Extensions to IMAP4 ABNF (RFC 4466)
●October 2006 - Comparators (Internet Application ProtocolCollation Registry) - draft-newman-i18n-comparator-14.txt - inRFC editor queue
●October 2006 - IMAP4 LIST Command Extensions (draft-ietf-imapext-list-extensions-18.txt) - in RFC editor queue, waiting forIMAP I18N document to finish
●IMAP ANNOTATE Extension (draft-ietf-imapext-annotate-16.txt) - in IESG evaluation
●IMAP METADATA Extension (draft-daboo-imap-annotatemore-10.txt) – per mailbox annotations
●The IMAP ENABLE Extension (draft-gulbrandsen-imap-enable-00.txt)
Recently completed work inIMAPEXT/LEMONADE WGs
●Dec 2005 - IMAP4 ACL Extension (RFC 4314)
●Dec 2005 - Update to UIDPLUS (RFC 2359), RFC 4315
●Jun 2006 - IMAP Extension for Conditional STORE Operation orQuick Flag Changes Resynchronization (RFC 4551)
●Apr 2006 - IMAP CATENATE Extension (RFC 4469)
●May 2006 - Message Submission BURL Extension (RFC 4468)
●May 2006 - IMAP - URLAUTH Extension (RFC 4467)
Forward-without-download
Lemonade interop eventOctober 2006, London
●4 servers
●2 clients (more promised soon)
●Bugs found, but things mostly work
IMAP URL
●Some [mostly minor] issues are found in F-W-D,CONDSTORE documents
Relative-path IMAP URLs
●draft-ietf-lemonade-rfc2192bis-02.txt
Needs review by URI experts
●Relative-paths are only used in IMAP CATENATE so far
●IMAP mailbox hierarchy separator can be different indifferent server:
INBOX.Apple.Green
INBOX/Apple/Green
●What is the meaning of:
..;UIDVALIDITY=385759045/;UID=20
.;UIDVALIDITY=385759045/;UID=20/..
Future work
●IMAPEXT
I18N document
SORT/THREAD
●LEMONADE
IMAP/SMTP compression
Quick reconnect
Content conversion
Improvements to SEARCH command
Filtered views
Controlling in-band/out-band notifications
Multimedia streaming
IMAP Internationalization
●draft-ietf-imapext-i18n-07.txt [expired]
●draft-ietf-eai-imap-utf8-00.txt
●Issues
Internationalized error responses
●Something similar is needed in SMTP
Usernames/passwords
●Frequently used as email addresses
Mailbox names
Domains, Addresses and Mail Headers
●EAI WG
IMAP keywords (?)
...
IMAP/SMTP compression
●Works in the same way as TLS or SASL securitylayer
●Stop gap until TLS compression is deployed inOSes
●IMAP document is past WGLC
●SMTP needs to be written
Would there be enough saving to make it worthwhile
Quick reconnect
●Goal: minimize reconnection cost whenconnectivity is poor
●IMAP: was a server side mechanism at first
●SMTP: revise RFC 1845 (SMTP ServiceExtension for Checkpoint/Restart) (?)
This might be less of an issue when BURL (F-W-D)is deployed
Content conversion
●Content conversion (draft-ietf-lemonade-convert-05)
E.g. convert a Word attachment to PDF
Similar to recently done IMAP BINARY extension
In WGLC now
Various improvements toSEARCH
●Improvements to SEARCH command
Aug 2006 - IMAP4 extension to SEARCH commandfor controlling what kind of information is returned(draft-melnikov-imap-search-ret-03.txt) - in RFCeditor queue
Virtual Mailboxes / Persistent searches (next slide)
draft-melnikov-imap-search-res-03.txt
draft-melnikov-imapext-filters-00.txt
draft-melnikov-imapext-multimailbox-search-01.txt
draft-ietf-lemonade-search-within-02.txt
Filtered Views
●Two proposals:
●draft-cridland-imap-context-00.txt
Persistent searches + paged results
●draft-ietf-lemonade-vfolder-01.txt
Virtual Mailboxes
Controlling in-band notificationsfor mailstore events
●Push email (IMAP IDLE, RFC 2177) worksgreat(*) and is widely deployed
●However servers report different events
●Need a catalog of events
draft-ietf-lemonade-msgevent-00.txt
●Need a way for the client to request specificevents
draft-gulbrandsen-imap-notify-01.txt
Other bandwidth/round triprelated optimizations inIMAP/SMTP
●QTLS (replacement for STARTTLS in SMTP)
●IMAP SASL-IR
●IMAP QRESYNC
Forward-without-download forencrypted content
●IMAP server can't do that, as it doesn't know thekey
●Security implications are serious
Do you trust your own IMAP server?
SIEVE
●Mail Filtering language, that can run in MTAs,MDAs, MUAs
●Selected items from the recently completed work:
Sieve Extension: Variables
Sieve Email Filtering: Vacation Extension
Spamtest extension
Future SIEVE work
●Extended abilities to process/manipulate emailmessages
Sieve Email Filtering: Body Extension
Sieve Email Filtering: Editheader Extension
SIEVE Email Filtering: MIME part Tests,Iteration, Replacement and Enclosure
●SIEVE Email Filtering language - reject extension
Needs ability to send UTF-8 error responses inSMTP
●Sieve Extension: Notifications
Important Informationaldocuments
●Internet Mail Architecture (draft-crocker-email-arch-05.txt)
●Deployment Considerations for lemonade-compliant MobileEmail (draft-ietf-lemonade-deployments-03.txt)