THINGS YOU SHOULD KNOW

   How do Email Spam Filters Work

If you are the one who works with emails on daily basis,you are mostly likely to be using a SPAM FILTER to ease the job shifting through a large number of spams emails every day.Needless to say that spam filter do make our job a lot simpler by automatically filtering out the spam without which it is almost impossible to manually filter the junk emails that arrive in millions each day.However,it is often necessary to have a basic knowledge of how spam filters work and on what basis they flag an email as spam.

How Spam Filters Work?

There are different kinds of spam filters:

Header Spam Filters

Header spam filter work by examining the header information of a particular email message to check if it appears to have been forged.The header of every email contains information which tells the origin of the email.i.e;The incoming email ID and usually the IP address(server address) of the sender. So spammers often forge the header to input a false sender ID and IP address so as to make it difficult to trace them.Thus if an email is supposed to have a forged header or if the same message is found to have been sent to multiple recipients,it is mostly likely considered as a spam by many filters.This method of spam filtering is often quiet effective,however occasionally it may result in some of the requested newsletter from being misdirected into the spam folders.

Content Spam Filters

Content spam filter is one of the most effective and wisely used filter to combat spam emails.They use a sophisticated algorithm with a set of pre-defined rules to determine whether a given email is a spam.They work by scanning the entire text/body of the email to search for specific words and patterns that make them resemble a typical spam message.Most content spam filters work based on the following criteria and check to see.

1.If the message speaks a lot about money matter.Commonly suspected words include:lottery,discount,offer,bank account,money back guarantee etc.

2.If the message contains adult terms like:viagra,pills,bed,drugs,hot   and so on.

3.If there is any sort of urgency.Most spam emails call for an urgency by using terms such as hurry,offer,valid till etc.

4.If the message contains a single large image with little or no tect then it is often considered  as spam by many filters.

Each content spam filter may have it's own st of additional rules using which it evaluates each incoming email.In most cases content and header spam filters are combines together to achieve higher level of accuracy.

Language Spam Filters

Language spam filter is designed to simply filter out any email that is not in the user's native language.Since spammers come from all parts of the world with different languages,a language spam filter can help get rid of those annoying emails that come in the languages that you can't read!

User Defined Spam Filters

User defined spam filters can be very handy,however they need a considerable amount of time investment in configuring and setting up a set the rules using which the filters works.

Other Types of Spam Filters

Popular webmail services like Gmail,Yahoo and Hotmail combine both header and content spam filtering techniques.In addition to this they also use their own algo's to combat spam.For some example services like Gmail uses "optical text recognition" to identify spammy text inside an image.Also users are provided with an option to "Report Spam"whenever a spam email accidently reaches the inbox.With the user feedback,the filters learns and becomes more powerful in carrying out the filtering process.




 

HOW TO TEST WORKING OF YOUR ANTIVIRUS ??

Have you ever wondered how to test your antivirus software to ensure it's proper working ?? No then i'll tell you how to do that  here we go -  

                                                  

STEP1 :-  Open a new text document and copy the exact code as shown below ::

                                     

X5O!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*

STEP 2 :-  Rename the file from New Text Document.TXT to   myfile.com file.

STEP 3 :-  Now run the antivirus scan on this myfile.com file.

If the antivirus is functioning properly on your computer,then it should generate a warning and immediately delete the file upon  scanning.Otherwise your antivirus is not working properly,you should update it (or) re-install it.  

WHAT IS CAPTCHA AND HOW IT WORKS ? 

CAPTCHA or Captcha which stands for "Completely Automated Public Turing test to tell Computers and humans Apart" is a type of challenge response test to ensure that the response is only generated
by humans and not by a computer.In simple words,CAPTCHA is the word verification test that you will come across the end of a sign up form while signing up for Gmail or Yahoo account.

             How to Alter Windows 7 Product ID 

 

 

It is possible to alter Windows Product ID and change it to what ever you like.For example,you can change the product id and put your nick name.The screenshot showing the altered Product ID is given below :

 

          

Here is step-by-step procedure to alter your Windows Product ID :-


1.GOTO Start->Run and type regedit


2.After you open the Registry Editor,navigate to the following key
 
Hkey_Local_Machine\Software\Microsoft\Windows NT\Current Version

3.On the right hand side,you can see an entry by name     ProductID listed under the heading Name.

4.Double-Click on ProductID,a dialog box will pop-up showing your Windows PID.Now you can delete the original PID and enter anything of your choice.

5.Once you are done,just click on OK and close the Registry Editor.Now you can see the altered Product ID in the Windows Properties Window.