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SMTP Service Extension for Media Size Declaration

This draft proposes an extension to SMTP for declaring media sizes in multimedia messages, allowing servers to manage quota per media or message context. It builds on existing drafts like RFC 1427, clarifying syntax and error handling. Open issues include defining available media types and exploring MediaSize vs. General Resource concepts.

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SMTP Service Extension for Media Size Declaration

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

  2. ESMTP – MediaSize extension • In a Multimedia / Multi-Context message store a “Quota per media” is maintained. • Implements 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)

  3. 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])…”

  4. MediaSize – Main updates in 01.txt • Format syntax corrected. • Clarified Server and Client actions in error conditions. • Added requirement for supporting at least 32 bit unsigned integer size-value representation

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

  6. For Further Information… • UM-LEMONADE mailing list • send ‘subscribe um' to: Majordomo@mail.snowshore.com • Contact us • Ari.Erev@comverse.com • Vladimir.Shveidel@comverse.com

  7. Additional / Spare slides

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

  9. MediaSize example • Example:C: EHLO merlot.mailsrv.com S: 250- merlot.mailsrv.com…S: 250 SIZE 1000000 S: 250 MEDIASIZE video:100sec;10000kb / fax:20pages;2000kb voice:10sec C: MAIL FROM:user@mail.com / SIZE=80000; video:7sec; fax:3pages S: 250 Address Ok. C: RCPT TO: <recv1@mailsrv.comS: 250 recv1@mailsrv.com OK; can accept / 80000;video:7sec;fax:3pages C: RCPT TO: recv2@mailsrv.comS: 452 insufficient system media storage / (fax): recv2@mailsrv.com Server

  10. MediaSize – Feedback Received • Dan Wing (Cisco): • Use only “message-context size”. • Need to externalize/define/clarify the Transformation among unit-sizes (or “use only size in bytes”). • Dan Kohn [dan@dankohn.com] • Use ‘kibibytes’ (not kilobytes).

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