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Enhancing Email Reputation and Identity with the SIQ Protocol: A Comprehensive Overview

The SIQ protocol, presented by April Lorenzen of Server Authority, Inc., provides a robust framework for email reputation and identity verification. Utilizing UDP with an HTTP fallback and supporting both IPv6 and IPv4 addresses, the SIQ protocol features efficient query handling, exponential backoff retries, and flexible transmission for diverse reputation data. Since July 2003, approximately 9 million queries and responses have been exchanged. Key stakeholders are actively developing plugins for popular systems like Microsoft Exchange, while methods to manage forwarding issues are underway, enhancing the overall efficacy of email reputation systems.

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Enhancing Email Reputation and Identity with the SIQ Protocol: A Comprehensive Overview

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  1. Server Index Query Protocolfor Email Reputation & IdentityPresented by April Lorenzen of Server Authority Inc

  2. SIQuery & ResponseUDP Packets • UDP w/HTTP fallback • Exponential backoff retries • Handles IPv6 & IPv4 addresses • Query ID, version, and query type housekeeping bits • Flexible for wide variety of reputation data transmission

  3. SIQueries in Production Use • SIQ clients & servers have exchanged approx. 9 million queries and responses in production use since July 2003 • Multiple SIQ clients in France have successfully received responses from SIQ server in USA (approx. 2 million queries thus far) • Sendmail milters for the SIQ protocol include a GPL'd Python version and a non-GPL C version • SIQ plug-in for Microsoft Exchange is in active development

  4. Fowarding is an Issue in Reputation Systems A reputation system that scores an IP address and a domain together should be skipped if the message is coming from a forwarding service or forwarded account Simple public domain mechanisms such as VARA (Verified and Recipient Authorized) are needed to determine when the reputation server query should be skipped

  5. VARA - Simple Public Domain Solution to the Forwarding Problem

  6. Who is developing SIQ protocol reputation services • OutboundIndex.org – service available now • Return Path – evaluating SIQ for a new reputation service • David Hohn of Uptime.at and Philipp Baer of Npw.net announced the intention to write an open source SIQ server and operate a free reputation service. • Petru Paler has expressed interest in creating an SIQ protocol interface for GOSSiP

  7. wiki.OutboundIndex.net/ProtocolDiscussion or type SIQ protocol into most any search engine Internet-Draft http://www.ietf.org/internet-drafts/draft-irtf-asrg-iar-howe-siq-00.txt FOR MORE INFORMATION

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