Information Technology Services 1 Copyright Copyright Marc Wallman and Theresa Semmens, 2006. This work is the intellectual property of the authors. Permission.

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Information Technology Services 1 Copyright Copyright Marc Wallman and Theresa Semmens, This work is the intellectual property of the authors. Permission is granted for this material to be shared for non- commercial, educational purposes, provided that this copyright statement appears on the reproduced materials and notice is given that the copying is by permission of the authors. To disseminate otherwise or to republish requires written permission from the author.

Information Technology Services 1.2 Open Source with Spam Filtering for the Enterprise North Dakota State University Fargo, ND

Information Technology Services 3 Overview Introductions About NDSU Description of Problem & Solution Development & Implementation Results Final Thoughts

Information Technology Services 4 About NDSU Land-grant institution – ,000 students, faculty and staff Part of HECN (Higher Education Computing Network) Provides services for six other ND institutions

Information Technology Services 5 Size and Scope of Services Typical message delivered <18 seconds Two systems –IMAP –GroupWise (approx. 400 accounts) Process for 23,000 addresses –Host IMAP accounts for 18,000 Accept approx. 135,000 messages daily for approx. 210,000 recipients

Information Technology Services 6 Problem Current spam filter not efficient Spam and unwanted received by campus community Diverse campus opinion on filtering angry complaints per day received by Help Desk

Information Technology Services 7 Solution Steps Solution required by University System Policy Users threatened lawsuits Plan of action –Spam Abatement Solutions Group –Spam Abatement Technical Group Project plan –ITLT approval –Provost approval

Information Technology Services 8 Spam Filter Solution An open source interim solution with varying levels of spam filtering the community could choose from –Year one budget: $35,440 (.5 FTE + hardware, support) –Year two budget: $21,380 (.25 FTE + hardware, support) –Year three budget: $15,130 (.25 FTE + hardware, support) Implement by August 2005

Information Technology Services 9 Filter Solution Levels LevelObvious SpamPotential Spam Disabled Deliver Quarantine Delete Deliver Quarantine Delete

Information Technology Services 10 Timeline Nov. 1, 2004 to August 2005: R&D April 1, 2005: Create policy May 1- July 30: Testing phase July 1-15: Survey Test Users July 30: Final assessment by testing group –Services Web page updated to include spam filter –Implement Safe & Block Sender Lists August 15: Filter is available service December 15: Review of project

Information Technology Services 11 Method: Tag and Deliver Delivery decision based on user selected rules. Tag all incoming mail as – Not Spam, – Potential Spam, or – Obvious Spam. Notes: Special tagging to accommodate Novell’s GroupWise. Manual delivery rules required for users forwarding their mail.

Information Technology Services 12 Benefits of Tag and Deliver 1.Quarantine is managed by user’s client. 2.Quarantined messages count against user’s quota.

Information Technology Services 13 Extra Features 1.Automatic purge of messages > 30 days in quarantine 2.Safe Sender and Block Sender lists 3.Re-registering for spam service will fix a user’s broken spam filter (e.g., a deleted quarantine folder)

Information Technology Services 14 Infrastructure

Information Technology Services 15 Advantages 1.Opt-in service 2.Solution integrated with existing services 3.Well defined, easy for end users to understand 4.Tagging method isolates mechanics of spam identification from user interface 5.All mail is tagged: Metrics on spam identification effectiveness are precise 6.Easy infrastructure maintenance 7.Scalable infrastructure

Information Technology Services 16 Disadvantages 1.Cannot make delivery decisions for users on systems where spam filtering takes place 2.Cannot make delivery decisions for back end mail servers (e.g., Listserv server) on systems where spam filtering takes place

Information Technology Services 17 Subscription Rate

Information Technology Services 18 Effectiveness

Information Technology Services 19 What it looks like

Information Technology Services 20 Tools Used Sendmail ( MailScanner ( Spamassassin ( Perdition Mail Retrieval Proxy ( UW IMAPd ( Procmail (

Information Technology Services 21 Questions? Marc Wallman Sr. Systems Administrator (701) Theresa Semmens NDSU IT Security Officer (701)

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