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Shades of gray: a closer look at emails in the gray area

Content Provider	ACM Digital Library
Author	Balzarotti, Davide Isacenkova, Jelena
Abstract	Every day, millions of users spend a considerable amount of time browsing through the messages in their spam folders. With newsletters and automated notifications responsible for 42% of the messages in the user's inboxes, inevitably some important emails get misclassified as spam. Unfortunately, users are often unable to take security related decisions, and tools provide no assistance to easily distinguish harmless commercial messages from the ones that are most certainly malevolent. Most of the previous studies focused on the detection of spam. Instead, in this paper we look into the often overlooked area of gray emails, i.e., those messages that cannot be clearly categorized one way or the other by automated spam filters. In particular, we analyze real-world emails by grouping them into clusters of bulk email campaigns. Our approach is able to automatically classify and reduce by half the gray emails area with only 0.2% false positives. Moreover, we identify a number of campaign features that can be used to predict the campaign category and we discuss their effectiveness and their limitations. Our experiments show that a large fraction of emails in the gray area are composed of legitimate bulk emails: newsletters, notifications, and marketing offers. The latter appears to be a large e-marketing business industry that has grown into a complex infrastructure for sending legitimate bulk emails. To the best of our knowledge, this is the first real-world empirical study of such emails.
Starting Page	377
Ending Page	388
Page Count	12
File Format	PDF
ISBN	9781450328005
DOI	10.1145/2590296.2590344
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2014-06-04
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Newsletters Email campaigns Spam
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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