SMTP Service Extension for message Media Size declaration (draft-shveidel-mediasize-01.txt) Ari Erev Vladimir Shveidel November 21, 2002 IETF-55 Update.

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SMTP Service Extension for message Media Size declaration (draft-shveidel-mediasize-01.txt) Ari Erev Vladimir Shveidel November 21, 2002 IETF-55 Update

ESMTP – MediaSize extension zIn a Multimedia / Multi-Context message store a “Quota per media” is maintained. zImplements a requirement from um-issues internet draft (draft-vaudreuil-um-issues-00.txt)  Same in concept as RFC 1427 (“ SMTP Service Extension for Message Size Declaration ” ) but extends it to “ multi-media ”.  Builds on “ message-context ” internet-draft (draft- ietf-vpim-hint-08.txt)

MediaSize Overview  “… Allows an SMTP client and an SMTP server to coordinate transmission of a message based on its size, classified by specific media type(s). This allows the server to manage quota per media or per message-context (see [6]) …”

MediaSize – Main updates in 01.txt zFormat syntax corrected. zClarified Server and Client actions in error conditions. zAdded requirement for supporting at least 32 bit unsigned integer size-value representation

MediaSize: Open Issues – for discussion z1. What are the available MediaTypes? yMessage-Context, Content-Type, IMAP Quota? yA new, specific one  2. MediaSize vs. “ General Resource ” yAbstrace resources examples: 1.MediaSize 2.Resource=No of Fax Pages. Measurment Unit = pages. 3.Number of Attachments 4.Number of attachements for a specific media-type (e.g.Number of Voice Attachments

For Further Information… zUM-LEMONADE mailing list  send ‘subscribe um' to: zContact us

Additional / Spare slides

ESMTP – MediaSize extension zEHLO-based capability: 250-MEDIASIZE media1:size1;size media2:size3 … zClient adds (optional) media:size as a parameter to MAIL command.  Server may reject message based on “ global size ” or “ media size ” quota basis.

MediaSize example  Example: C: EHLO merlot.mailsrv.com S: 250- merlot.mailsrv.com … S: 250 SIZE S: 250 MEDIASIZE video:100sec;10000kb / fax:20pages;2000kb voice:10sec C: MAIL / SIZE=80000; video:7sec; fax:3pages S: 250 Address Ok. C: RCPT TO: S: 250 OK; can accept / 80000;video:7sec;fax:3pages C: RCPT TO: S: 452 insufficient system media storage / (fax):

MediaSize – Feedback Received zDan Wing (Cisco): y Use only “message-context size”. y Need to externalize/define/clarify the Transformation among unit-sizes (or “use only size in bytes”). zDan Kohn  Use ‘ kibibytes ’ (not kilobytes).