Date post: | 09-May-2015 |
Category: |
Technology |
Upload: | shalini-gs |
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Seminar on “web-mail filter”
Introduction
In today’s world electronic mail (or popularly known as e-mail) is a very powerful medium for transferring messages to other users.
Like every powerful medium it is prone to be misused. One such case of misuse is the posting of
unsolicited emails known as spam.
Adverse effects of spam
Too noisy Inbox. Misleading information distribution.
Virus spreading programs and Mails
Wastage of allocated memory space for Inbox.
Web-mail filter??????
Spam filtering comes in two forms
Server side filtering
Client side filtering
The filtering occurs on the server before the emails are seen.
User filters that are created by the email client, redirects emails that are 'marked as Spam’ to a specific 'Spam' folder
Server side filtering
Recognizing the words that are likely to appear as spam.
universal virus definitions.
universal block list of IP addresses(UBL).
Client side filtering Checking the mails against Subject and from Email ID specified
by the user.
Checking the mails against the size limit of the mail specified by
the User.
Reporting a message as “spam” by the user.
Architecture
Module based approach
Admin: This module deals with the management of the application by a
person called Administrator who is responsible for taking all the mails coming
to the people working in the organization, and invoking the filtering mechanism
can also specify UBL IP addresses and Universal Virus definitions in order to
protect the systems from attack.
User:This module deals with user processing. In this module user can
specify what he doesn’t want.
Filtering: This module deals with the major task of Mail Filter
Spam filtering mechanism in gmailHow messages are marked as Spam inGmail???
Gmail has an automated system that helps detect spam by identifying viruses and suspicious messages and learning from what Gmail users like us commonly mark as spam.
why that a particular message in GMAIL is placed in Spam?
Phishing scams
Messages from an unconfirmed sender.
Message content is empty
Messages you sent to Spam
Administrator-set policies
Phishing scams
Some spammers send fraudulent messages that try to trick you into sharing personal information like passwords or credit card numbers. This practice is called phishing
Messages from an unconfirmed sender
Spammers can forge a message to make it
look like it's sent by a real website or
company that you might trust. To help
protect you from such messages, Google
tries to verify the real sender using email
authentication
Message content is empty
An email with no content in the subject and body of
the message might be classified as spam.
Messages you sent to Spam
You previously marked these messages as spam by
clicking the "Report spam" or "Report phishing" button
Administrator-set policies
If your organization uses Gmail, the administrator within
your group can decide what messages will be marked as spam.
AdvantagesIncreased productivity
Personalized filter.
Phishing scam protection
White listing capabilities.
Users who receive a low volume of email will have to wait
longer to establish an adequate database.
Word based filters and list based filters have lots of
disadvantages
Disadvantages
Email filter is used to inspect outgoing email at some
companies to ensure that employees comply with
appropriate laws.
Malware can comprise a user's sensitive private data
by capturing bank account information, usernames
and passwords. Spam blocker applications can assist a
user in preventing these types of PC contaminations.
Applications
Conclusion
Web mail filter is a mechanism for classifying
message as either spam or non-spam.
Its reduces the overhead for the users by filtering
out unwanted or uninvited messages in the inbox.
It provides security for your mailbox by filtering
out contaminated messages.
Based on the future security issues, security can be
improved using emerging technologies.
A survey on spam filtering:www.scirp.org/journal/PaperInformation.aspx
en.wikipedia.org/wiki/Anti-spam_techniques Defeating spam:www.techtarget.com Email Spam Filtering:Gordon V. Cormack www.howstuffworks.com www.ieee.org/documents/ieeecitationref.pdf
References