Page 56 - ASBIRES-2017_Preceedings

Alagalla & Arudchelvam
This is a basic example of runtime encoding.
There are many schemes to reduce file size
by eliminating redundancy.
3.3 Step 3: Classifying Spam
Through the above steps, we take
standardized e-mail documents as a training
document, pre-processing of e-mail,
extracting useful information, saving in text
documents according to the attachment
format, dividing the entire document into
words, extracting Spam document feature
vector and translate into the array format
that is vector array.
We look for the optimal classification
using the selected algorithm that is
constructed using the feature vector of the
spam document by Google
3.4 A Specific ISP (Internet Service
Provider)
Few things could cause a specific ISP,
like Comcast or Hotmail, to junk emails:
 A bad IP reputation will get emails
junked. Protect IP reputation.
 Not having a sunset policy in place for
unengaged prospects leads to bad
engagement metrics, which makes email
look unwanted and spammy.
 Not segmenting out prospects can be
made to look spammy. For example, if
send tons of emails to Comcast email
addresses one day, they're going to
assume spamming. This helps show ISPs
that emails are legitimate and wanted.
4 IMPLEMENTATION
4.1 SPF Records (Sender Policy ramework)
Sender Policy Framework (SPF) is a
simple email validation system designed to
detect email spoofing by providing a
mechanism to allow receiving email
exchangers to verify that incoming mail
from a domain comes from a host authorized
by the administrators of that domain. The
list of authorized sending hosts for a domain
is published in the Domain Name System
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(DNS) which records for that domain in the
form of a specially formatted TXT record.
Email spam and phishing often use "forged"
addresses. Therefore, publishing and
checking SPF records can be considered as
anti-spam techniques.
The Simple Mail Transfer Protocol
allows any computer to send email claiming
to be from any source address. This is taken
as an advantage by spammers who often use
counterfeit email addresses; making it more
difficult to trace a message back to their
source; easy for spammers to hide their
identity in order to avoid liability.
SPF allows the owner of an Internet
domain to specify which computers are
authorized to send email with "from"
addresses in that domain, using Domain
Name System (DNS) records. Receivers
verifying SPF information in TXT records
may reject messages from unauthorized
sources before receiving the body of the
message.
Therefore, the operating principles are
similar to those of the DNS-based black hole
lists (DNSBL), except that SPF uses the
Domain Name System (DNS) authority
delegation scheme.
v=spf1 ip4:192.0.2.0/24 ip4:198.51.100.081
a –all
"v=" defines the version of SPF used.
The following words provide mechanisms to
use to determine if a domain is eligible to
send mail. The "ip4" and "a" specify the
systems permitted to send messages for the
given domain. The "-all" at the end specifies
that, if the previous mechanisms did not
match, the message should be rejected.
4.2 DKIM Records
Identified Domain Key Mail (DKIM)
helps protect company from spam and
phishing email attempts.
Further, the proposed system provides a
method for validating a domain name
identity that is associated with a message
through cryptographic authentication.