Sender ID is an anti-spam proposal from the MARID IETF working group, joining Sender Policy Framework and Caller ID.

The Sender ID proposal is currently the subject of controversy regarding intellectual property and licensing issues: Microsoft holds patents on key parts of Sender ID and licenses those patents under terms that are not compatible with the GNU General Public License and which are considered problematic for free software implementations in general by free software groups like the Apache Software Foundation and the Debian project .

The MARID IETF working group has stopped their work on the new standard because of major differences between the members of the group on 2004-09-23 .

See also

• Email Authentication
• Sender Policy Framework
• DomainKeys
• Trusted Email Open Standard

External links

• Sender ID Framework Microsoft Corporation
• ASF Position Regarding Sender ID statement from the Apache Software Foundation
• Debian project unable to deploy Sender ID statement by the Debian project
• Is Sender ID Dead in the Water? - No MARID Working Group Consensus coverage and discussion on groklaw
• IETF Decides on SPF / Sender-ID issue coverage and discussion on slashdot
• MARID Co-Chairs Clarify Concensus Statement
• Two articles on the history of Sender-ID:
  • http://www.circleid.com/article/730_0_1_0_C/
  • http://www.circleid.com/article/732_0_1_0_C/
• MARID to close mailing list thread.
• Open source SenderID module for Apache