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SureMail: Notification Overlay for Email Reliability

SureMail enhances email reliability by detecting and preventing loss, delay, and spam in transit. It ensures message authenticity and privacy while minimizing disruption to users. The experiment results demonstrate the effectiveness of SureMail in addressing email issues.

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SureMail: Notification Overlay for Email Reliability

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  1. <SureMailMsg type=“post_not” toAddrHash= “ 1251de1ab4532dd06851ac3ed237f809dcaa0126 ” ttl = “ 43200s” bodyHash =“ 56893db1ea38600dbaeef123765098ad96ef9ddd ” ssId = “ 89d03cca4dba4791abed498d876ca0023abcefd1 ” auth = “ ab11211189defa3d45c09268daaae9bc32a1223a ” /> notification 4 + 20 x 3 = 64 bytes SureMail: Notification Overlay for Email Reliability Sharad Agarwal, Dilip A. Joseph, Venkat Padmanabhan http://netprofiler Email Loss & Delay • Why ? • Aggressive spam filters • Upgrades/downtime/failure • 90% email to MSFT tossed ! • Often silent(no bouncebacks) • Delay can be as bad as loss SureMail Architecture • Client-based approach • No server mods., no PKI • Separate notification overlay • Sender: post notification • Recipient: “You’ve lost mail” Notification Format • Receiver hash H(R) • Time to live T • Email body hash H(Mnew) • Shared secret H(Mold) • Authenticator MAC([T,H(Mnew)], H’(Mold)) • Hard for spammer to spoof Experiment • 36 sending email accounts • 42 receiving email accounts • MSFT, EDU, Hotmail, Yahoo, …, US, UK, AU, NZ, CA … • Enron corpus (1266 bodies) • Attachments (DOC, JPG,…) Salient Features • Minimal disruption • Minimal demands on user • Preserves asynchronous comm., privacy, repudiability • Maintains spam, virus defense • Low overhead Results • 83 days • 158,379 emails sent • 3,183 emails lost • Loss rate 1.82% to 3.36% • Silent loss 0.71% to 0.91% • Delay: mean 276 seconds max 36.6 hours Status • Prototype implementation • Run SureMail experiment • 29 days, 19435 emails sent • All 653 lost emails caught! • HotNets 2005 paper • Patent application pending Key Mechanisms • Email-based handshake • Prevents impersonation • Reply-based shared secret • Blocks notification spam • Automatic reply detection • Based on text similarity Received: from iktulaut.web.ca (localhost [127.0.0.1]) by list.web.net (Postfix) with ESMTP id C24785A92; Wed, 29 Jun 2005 15:24:14 -0400 (EDT) Received: from post.web.ca (post.web.ca [192.139.37.29]) by list.web.net (Postfix) with ESMTP id 835755968; Wed, 29 Jun 2005 10:32:23 -0400 (EDT)

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