Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Analyzing the Social Structure and Dynamics of E-mail and Spam in
  Massive Backbone Internet Traffic   E-mail is probably the most popular application on the Internet, with
everyday business and personal communications dependent on it. Spam or
unsolicited e-mail has been estimated to cost businesses significant amounts of
money. However, our understanding of the network-level behavior of legitimate
e-mail traffic and how it differs from spam traffic is limited. In this study,
we have passively captured SMTP packets from a 10 Gbit/s Internet backbone link
to construct a social network of e-mail users based on their exchanged e-mails.
The focus of this paper is on the graph metrics indicating various structural
properties of e-mail networks and how they evolve over time. This study also
looks into the differences in the structural and temporal characteristics of
spam and non-spam networks. Our analysis on the collected data allows us to
show several differences between the behavior of spam and legitimate e-mail
traffic, which can help us to understand the behavior of spammers and give us
the knowledge to statistically model spam traffic on the network-level in order
to complement current spam detection techniques.

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The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph