Anti-Spam Overview

Almost every Internet user who has used an email address is subject to SPAM ". All kinds of spam are like a group of stinks, which are annoying but lingering. Now, if you have mastered the following tips, it can greatly reduce the troubles caused by spam.
SPAM Classification
SPAM is short for Stupid Persons 'advertisement. Chinese means the use of e-mail on the Internet to broadcast advertising. The so-called "know, know, and know" means a hundred victories. To achieve a brilliant "war result", you must uncover the "Disguise" of spam in order to recognize its "evil face" in time and handle it accordingly. Currently, I think all spam can be roughly divided into three types:
1. Gentleman type. It is called a "gentleman", mainly because most of these spam mails are open to the door, it can be seen from the mail header that it is a spam email, such as promoting a website, introducing a product, or some mailing lists. It is never exposed to the public, making people clear at a glance, it's a pity that you are going astray ). In addition, its features are also obvious, that is, the mail title is rarely changed and there are certain rules, but currently there are fewer and fewer such spam emails, because it is easy to be filtered by filtering rules, if the expected effect cannot be reached, the system will gradually "Fade out.
2. villain. This type of spam is just like the common "villain" in the TV series. In order to achieve the goal, you have to do all the sinister and cunning work. For example, in the title, fake network administrators send you letters and claim to be your friends. The ultimate goal is to prevent you from deleting and reading them, you may even plant a Trojan ". In addition, this type of spam also uses methods such as changing the Sending address and email subject each time, so that you cannot block the emails directly by using the filter rules, which is even more difficult to prevent.
3. Bombing. This is an alternative type of spam. It mainly sends a large number of spam emails with repeated content to the recipient through the mail sending software, with the intention of cracking the recipient's mailbox and making it lose its normal reception effect, it carries a certain amount of prank and a strong sense of revenge. However, this type of spam is also the easiest way to deal with it: use the remote mailbox function to sort the topic or sender, and then delete it all at once.
Current popular countermeasures and limitations
Currently, major newspapers and websites have the following methods to deal with spam:
1. Use filtering rules to automatically delete spam through software or websites.
Currently, the most common method is to directly filter and delete spam from the server by filtering rules. At the beginning, the effect of dealing with gentleman-type spam had to go, but as time went by, spam senders became increasingly "smart. This method gradually loses its expected effect, and it also has a side effect: the more filter rules you set, the slower the email receiving speed. The principle is simple, because each letter must be detected by many filtering rules before it can reach your inbox. How can this problem be solved? Therefore, I do not agree with the practices of filtering spam through a large blacklist for professional anti-spam, and I doubt the actual effect. Of course, if you set the filter rules on the server of the mailbox provider, there is no impact on your email receiving speed, but every time you add or modify the filter rules, you must log on to the server, whether it is worth doing so is wise.
2. Return the email through professional software
Some software can automatically send an email to the spam sender. The general content indicates that the sent address is incorrect or does not exist, try to make spammers really think that the sent address is invalid, and thus escape the bad luck of becoming the target of sending. At first glance, I thought this method was brilliant, but I found some problems after thinking deeply. The current mass mailing software has become increasingly intelligent. It not only automatically collects e-mails, but also automatically checks the validity of e-mail. For example, it tries to test the sending of each e-mail address, however, it is not true to send emails, but more like our daily website ping method. Once it proves that e-mail is valid, it is difficult for you to give up.
3. delete spam through the remote email Function
Use Foxmail, the bat! And other software remote mailbox functions, directly view the header information of suspicious mail is composed of the sender, subject, routing and other information), so as to identify which is spam mail, then, delete it directly on the server. This method avoids accidental deletion or removal by using filtering rules, without losing a feasible method. Unfortunately, this method must be performed in the connected State. If the number of emails is large, it is difficult to tell clearly in a short time, users with hourly fees may also spend more money.
My Solutions
Since the above methods all have some problems to varying degrees, is there a better solution? The answer is yes. After a long time of online practice, I finally found a practical improvement solution, that is, to put the work of viewing the header information in the remote mailbox function offline, the specific operation process is: when you connect to the server for the first time, only the mail header information is downloaded. → analyze the mail header information from the lower network → identify the mail with the delete mark and the received mail with the download mark) → connect to the server again to download the new mail header information, and delete spam and retrieve useful emails based on the original identity. This completes a complete email receiving process.
Some may think that this method is similar to using the remote email function, and it is troublesome to log on to the server for the second time. Indeed, this method is very similar to the remote mailbox function, but the biggest difference is: online operations, offline operations, two word difference, the effect is completely different. First, this solution overcomes two disadvantages of the remote email function: the operator does not need to stay online for a long time, reducing the burden on the server and reducing the cost of the timer user. Second, it gives you plenty of time to identify spam. Because you put all the work of viewing header information and identifying emails offline, you can do it only when you are free, giving you the maximum degree of freedom.
Other skills　
Pay attention to the following points to minimize spam intrusion:
● When selecting free emails, try not to pick the famous free service provider. As the saying goes: "A big treasure" is too famous. It often attracts the special attention of spam manufacturers and the chance to receive spam increases.
● The account name should not be too popular. One of my superman mailboxes receives the most spam mails, because the accounts are too easy to guess and naturally become the target of all.
● Reasonably allocate and use mailboxes for "dedicated mail ". Take three mailboxes as an example. Mailbox A can be used for communications between friends and companies, mailbox B is used for subscribing to electronic magazines, and mailbox C is publicly used for newsgroups, BBS, and other activities. Obviously, mailbox A and mailbox B will receive very few spam mails, and mailbox C will often receive spam mails. According to this situation, mailbox A and mailbox B can be received by conventional methods, while mailbox C Can Use offline analysis of mail header information. Truly flexible and targeted.
Step Chart solution
The following uses Outlook Express6 as an example to describe how to view the mail header information offline based on the actual operations.

Step 1: Create an IMAP account. Run OE, open "Tools> account> email> Add> email", and enter the required information in the Wizard window. This process is no different from creating a POP account. You only need to set the mail protocol to IMAP and set the relevant server.

Step 2: view the folder list. After an account is created, a prompt window appears in OE. When you access the Internet and click "yes", the software will automatically log on to the server and display all folders, in this case, you can hide folders that are not frequently used on some servers. After the system automatically updates the folder, it will automatically disappear.

Step 3: Open "Tools> Options> maintenance" and set options as shown in the figure.
Step 4: First click "imap.21cn.com", then click "inbox", and then select "as long as the mail header" in the "Settings" button. As for other folders, to reduce the download time, we recommend that you leave the small box to be empty ).

Step 5: receive the mail title, and then identify it when there is no time. Click the "Synchronize account" button to download the new mail title from the server. You can see the detailed information in the information window popped up by OE throughout the process. Double-click the email and open "File> Properties> details" in the new window to view the email title. You can also check the "email source ".

Step 6: process the email. Mark the spam and suspicious emails with the delete icon and the emails you want to receive as downloads. After connecting the lines, click "Synchronize account.