WO2005013030A2

WO2005013030A2 - Email system making spam-mail blocked or traced

Info

Publication number: WO2005013030A2
Application number: PCT/KR2004/001790
Authority: WO
Inventors: Jay-Yeob Hwang
Original assignee: Solmaze Co., Ltd
Priority date: 2003-07-19
Filing date: 2004-07-19
Publication date: 2005-02-10
Also published as: KR20050010367A; WO2005013030A3

Abstract

The present invention relates to a method of spam-mail blocking, in particular such a method, in which, a mail having an address which is not registered at the address book is blocked, and a sender confirmation mail is sent to the sender to inform that the mail sent by the sender is blocked and not yet delivered, and that the blocked mail will be delivered to the receiver if the sender selects the business type. It warns that the advertisement mail which the receiver does not consent to receive will be refused, displays the current connection IP address, and induces the sender to give up the delivery voluntarily. Even though the sender selects the business type and the blocked mail passes into the mailbox, the collected IP address can be used as information for arresting the sender.

Description

EMAIL SYSTEM MAKING SPAM-MAIL BLOCKED OR TRACED

Technical Field The present invention relates to a method of spam -mail blocking, in particular such a method, in which, a mail having

an address which is not registered at the address book is

blocked, and a sender confirmation mail is sent to the sender to

inform that the mail sent by the sender is blocked and not yet

delivered, and that the blocked mail will be delivered to the

receiver if the sender selects the business type. It warns that

the advertisement mail which the receiver does not consent to

receive will be refused, displays the current connection IP

address, and induces the sender to give up the delivery

voluntarily. Even though the sender selects the business type

and the blocked mail passes i nto the mailbox, the collected IP

address can be used as information for arresting the sender.

Background Art FIG. 1 shows a conventional method which does not have a

spammer IP collection facility. The following description explains the method depicted i n

FIG. 1. When a strange mail arrives having an address which is not

registered at the address book, it is blocked. The server sends an automatic reply mail as shown in FIG. 1 to the sender which

informs 1 that the mail sent by the sender is not delivered yet

and guides how to select the business type 2. The blocked mail

is classified again according to the selected business type. The method has an effect of blocking a spam -mail. That is, the

automatic response mail includes a warning message 3 saying t hat

the delivery of the spam -mail by selecting another business type

intentionally will be refused. It prevents the sender from

retrying to show the receiver the blocked spam -mail if the intention of the refusal is declared in advance.

In the above method , even though it is easy to report to

the police, since there is no way to identify the spammer's IP

address, it is not easy to arrest the spammer, so that some

spammers may ignore the warning and retry to send spam-mails. In addition, the challenge/response system (U.S. Patent No.

6,199,102), which is one of the methods which blocks perfectly

the spam-mail sent by the computer, blocks a strange mail having

an address which is not registered at the address book, makes

the sender to read and input the image number identified only by

eyes, and unblocks the mail if the response is correct. A

membership newsletter is sent by a computer and is difficult to

be distinguished from a spam -mail, so that it has a problem of

excessive blocking. A spam -mail ordered by a mail after

receiving a reply mail cannot be blocked. The following description explains the technique about tracing the IP address of the mail receiver.

Korean Patent Application 10 -2001-0042998 discloses the

technique of reporting the actual connection IP address of the

receiver to the server by downloading and executing the Java applet on opening the mail by the mail receiver.

Disclosure of Invention

The present invention has been made in order to solve the

above problems occurring in the prior art, and it is an object

of the present invention to provide an email system, in which

every spam-mail is blocked and the blocking cannot be avoided as

long as the sender does not want the current connection location

to be detected and does not want to be attacke d by the police,

so that it is of no use to send a spam-mail itself and spam-mail

is eradicated by itself.

Another object of the invention is to provide an email system, which can avoid excessive blocking of the membership

newsletters caused by accomplishing the above purpose.

A spam -mail often is compared to a trash, but it is more

appropriate to be compared to a solicitor in that it is

indiscriminately sent and carries on a business. A solicitor cannot go into an office of a company guarded thoroughly. S o a solicitor cannot even conceive the idea of

entering the office guarded completely. Let us look over the procedures how a guard controls the incoming and outgoing persons .

An acquaintance who used to enter is allowed to enter.

If a stranger comes, the g uard blocks the person and asks

where he comes from and what the business is. A visitor who is identified and has a proper purpose is

allowed to enter, but a visitor who is not identified or does not have a proper purpose is not allowed.

To block and eradi cate spam -mails, which is the object of

the invention, the spam -mail blocking gets an idea from the

security system which blocks solicitors.

That is, a known mail (the address of the mail is in the

address book) is delivered to the mailbox; a strange mail (the

address of the mail is not in the address book) is blocked; with

a warning message saying that a spam -mail is refused, it is

informed that the mail will be delivered to the mailbox if the

sender selects the business type; when the sender selects the

business type and presses the confirm button (what the business

is) , an automatic reply mail which traces the current connection

location (from where the mail from) is sent; the mail from which

the sender and the connection location is confirmed is unblocke d

and delivered to the mailbox according to the business type; and

the mail of which the sender and the connection location is not

confirmed is kept unblocked. That is, a mail with an address which is not in the address

book is blocked, and be delivered to the mailbox when the sender confirms the business type. To confirm the business type, the

sender's current connection location is necessarily exposed.

Having received a warning message saying that a spam -mail is

refused, if the spammer selects a normal business type and sends

the mail, he breaks the law and the current location is exposed.

If a user reports the spam, police officers may come in several

minutes .

After all, either the spam -mail is blocked or the location

is exposed. The spam -mail is block ed 100% as long as the sender does

not want to see the police in a short time.

Brief Description of Drawings

Further objects and advantages of the invention can be more

fully understood from the following detailed description taken

in conjunction with the accompanying drawings, in which:

FIG. 1 shows a conventional method which does not have a

spammer IP trace facility; FIG. 2 shows a sender confirmation mail according to the

invention; FIG. 3 shows a confirmation of sender classification

selection; FIG. 4 shows an automatically generated spam-mail report; FIG. 5 is a sender confirmation mail showing a guide of an

automatic reply of a newsletter sender and a program download l ink ;

FIG. 6 shows a sender confirmation mail with a computer exclusion means; and

FIG. 7 is a flow chart showing the operation of the invention.

Best Mode for Carrying Out the Invention

The preferred embodiments of the present invention will be

hereafter described in detail with reference to the accompanying

drawings .

The invention is configured as follows. 1. Basic Type

A. Automatic Classification Address Book

This is a list of all the mail addresses used for

exchanging mails by a user, and the mailboxes for automatic classification are assigned for each address. This can be

implemented simply by adding a mailbox field for each address to

a general address book means.

B. Automatic Classification Means When a new mail arrives to a user, the sender address and

the above Automatic Classification Address Book are compared. If

the sender address is in the address book, the mail is delivered

to assigned mailbox, or the mail is blocked. C. Sender Confirmation Means This is a means to confirm the business type of the above unconfirmed person. As soon as the mail from the unconfirmed

person i s blocked, a sender confirmation mail is sent to the

unconfirmed person. The mail informs that the mail sent by the

unconfirmed person is blocked, and the mail will be delivered to the appropriate mailbox if the business type is selected. It

displays a warning message saying that the spam -mail is refused.

On selecting the business type and pressing the confirm button,

a program starts to trace the current connection location of the

unconfirmed person. FIG. 2 shows a sender confirmation mail according to the invention.

If an unknown mail is blocked, an identification number is

assigned to the mail and a sender confirmation mail which can be

one-to-one paired with the identification number is

automatically generated. A sender confirmation mail consists of

a guide message stored in advance 4, a sender classification

menu 5, a confirm button 6, and a spammer warning message 7 in

an HTML document. The contents of a guide message 4 are that the

mail sent by the sender is not delivered; it can be delivered if

the business type is selected; and it will be deleted

automatically if there is no response for a predetermined time.

The sender classification menu 5 has a normal mail and a membership newsletter mail menu items. Since the confirm button

is linked to the current connection location trace program, on

pressing the confirm button 6, the current connection location of the unconfirmed user is traced and logged at the server. Then

a new window pops up to confirm the selections. On pressing the

confirm button 6, a new window appears and the current

connection location trace program written in Java applet can be

executed. The spammer warning message 7 says that the

advertisement mail not consented to be received is unaccepted.

FIG. 3 shows a confirmation of sen der classification selection .

When an unconfirmed user presses the confirm button 6, a

new window such as FIG. 3 appears. The above traced current

connection location is displayed 8 on the window and warns the

spammer not to try to release blocking recklessly.

The confirm button 9 is implemented as a link to call a

server program which delivers the blocked mail to the assigned

mailbox. The link includes the identification number assigned

when the sender confirmation mail created, and the original mail

can be located correctly.

D. Blocking Release Means

By receiving the selected value through the confirm button

9 of the sender classification menu, the blocking of the mail is

released. The mail is moved to the friend mailbox if the

business type is friend, to the business mailbox if business, to

the newsletter box if newsletter. The mail is deleted if cancel

is selected. The sender address is added to the automatic

classification address book automatically. The mailbox to be classified automatically depends on the selected business type.

The address which is added automatically and the automatic

classification mailbox are to be confirmed finally by the user

when the user reads the mail . E. Unconfirmed User IP Log Means

The current connection location of t he unconfirmed user is

logged to be used as spam report data.

F. Spam-mail Report Generation Means

If a user judges the mail which is moved to the mailbox by

the blocking release means a spam, and presses the spam report

button, the current connection addr ess of the unconfirmed user,

which is logged at the unconfirmed user IP log means, is

included in the spam -mail report automatically. To report a

spam-mail in the Opt -out method, it is necessary to prove that

the mail is sent again against the refusal of delivery. It is

difficult to prove the fact that the user had refused the spam

mail more than once before receiving the spam -mail. Opt-out is a

method which regards sending a mail to a person who refuses the

delivery of mail as illegal. In addition, eve n though a spam -

mail is reported, it is very hard to trace the spammer.

According the invention, the delivery to the mailbox itself can

be a proof and the current connection location of the spammer is

secured, thereby the spam report can be made very easi ly and the

spammer can be arrested as a criminal in an act. For this

purpose, it is very effective to prepare a spam report button in the mail read window. That is, a spammer sends a spam, receives

a sender confirmation mail, and selects the business typ e. On

pressing the confirm button 6 ignoring the spammer warning, the

spammer's current connection location 8 is logged at the server,

and the blocked mail is moved to the user's received mailbox. At

the mail receiving alarm, the user immediately opens t he mail,

recognizes the receiving of a spam, and presses the spam report

button. The server automatically report a spam to the

authorities concerned with a copy of the spam, the spammer

warning message 7, the date and time of reading the warning

message, the date and time of the delivery of the spam by

retrying to send the spam, and current connection location 8.

The officer who received the report goes to the place where the

current connection IP is used and can arrest the criminal on the

spot. By press ing the spam report button, the report form

depicted in FIG. 4 is generated with all the necessary data, and

the user only needs to report this form by mail or other

predetermined ways .

FIG. 4 shows an automatically generated spam-mail report. The spam-mail report includes the email address of the spam

receiver 10, the sending address of the spam -mail 11, the date

and time of the first arrival of the spam -mail 12, the date and

time of the spam -mail blocking 13, the date and time of

informing the blocking and refusal of the delivery 14, the date

and time of retrial by the spammer 15, the date and time of spam-mail delivery 16, the IP address of the spammer at the time

of the retrial 17, the original copy of the sender confirmation

mail 18, the original copy o f the spam -mail 19, and the service

provider's comments 20 certifying that the above data correspond

to the log of the server 20.

As described above, even though a spammer sends a spam-mail

in the Opt -out system, the result is either that the sender

becomes an illegal spammer and exposes his current connection

location as soon as he selects the business type and delivers

the spam -mail to the mailbox, or that the spam -mail is 100%

blocked as if it were Opt-in.

2. Newsletter Sender Automatic Response Type Generally, a membership newsletter is a bulk mail. Since

new members do not have the address of the membership newsletter,

an internet service provider will receive a large quantity of

the sender confirmation mail. To cope with the case easily, a

client program is distributed to enable the batch response for

the membership newsletter.

However, a spammer can use the batch response to the sender

confirmation mail at a certain place like a PC cafe reserving

the execution of the client program and staying away t he place.

So a batch response must be used only by qualified internet

service providers, not by spammers. To accomplish the above purpose, the real name authentication must be gone through to

execute the client program. That is, even though a spammer do es not expose his current location by staying away from the place,

he cannot use the client program without identifying himself.

The qualified newsletter mailers can use the method freely.

The above method is implemented comprising more means described as follows.

FIG. 5 is a sender confirmation mail showing a guide to the

automatic reply of a newsletter sender and a program download

link.

A. Personal Authentication Means Various solutions such as authorized certificate are used

to authenticate a person. Here, more generalized method is used

as an example. For example, a password is sent to a cellular

phone by SMS, and the password is entered by the user. The

person who enters the corresponding password can be considered

as the right user of the cellular phone. The personal cellular

phone is opened with a real name, and has an effect of

identifying a person in a certain degree.

B. Newsletter Sender Automatic Response Program

Authentication Means This is a server program which authenticates the Newsletter

Sender Automatic Response Program as a program in normal state.

C. Newsletter Sender Automatic Response Means This is a client program, in which the program is

authenticated by the Newsletter Sender Automatic Response

Program Authentication Means. After the unconfirmed user passes the above authentication means, information about the

unconfirmed user authenticated by the authentication means is sent to the server, thereafter multiple sender confirmation

mails need not to be opened individually by the brow ser and are

responded automatically in a batch mode.

For the batch response, a client program sequentially reads

and decodes the sender confirmation mails from a specific

directory of a client system. The client program identifies the

unique number of the sender confirmation mail, the sender

address, the receiver Id, and the file name of the mail to be

classified, and transfers to the server program, through the

predefined socket, which processes the newsletters. The server

program moves the mail from the blocked mailbox to the

newsletter mailbox and returns the result value to the client

program.

D. Newsletter Automatic Blocking Release Means When the batch response is received from the Newsletter

Sender Automatic Response Means, the blocking of the

corresponding mail is released. All the released mails are moved

to the newsletter mailbox, and the sender address and the

reference address are automatically added to the receiver' s

automatic classification address book. In this way, the internet

service provider who sends the newsletter inserts the address of

the other operator, which is needed to provide service, into the

reference address field. The address is to be added to the user's address book automatically. From then on, the operator's

mail needed for service is not blocked and delivered to the user

immediately.

E. The means to insert information of a unconfirmed user

who is authenticated when the spam -mail report is generated automatically

When a user reads a newsletter the blocking of which is

automatically released and presses the spam -mail report button,

the information of the authenticated unconfirmed user is

automatically included in the spam -mail report form, so the

spammer information is reinforced.

3. Computer Exclusion Reinforcement Type

In the basic type, if a spammer tries a batch response to

sender confirmation mail making a batch response program by

himself, he has to install the program in a public place like a

PC cafe, reserve an execution, and stay away from the place.

Actually, most of the spammers do not receive return mails, and

the addition of the address to the address book goes through the

final confirmation of the user, thus the spam -mail comes to an

end for once, so that there is a bare reason to do so at all the

risk. Though the automatic response program is used despite the

risk, the classification program in the server must be called

and the called program opens a web browser, so it is hard to

execute the program in secrete at other's computer. To cope with the situation co mpletely, the method is implemented comprising more means described as follows.

A. When a specific unconfirmed user responses to a sender

confirmation mail predetermined number of times for a

predetermined time, for example, a spammer's trial is excluded

by making it impossible to respond through a computer from the

second trial. Here explains the method to implement briefly.

When a sender confirmation mail is sent, the identification of

the sender confirmation mail, the file name of the receiving

mail, the randomly generated 4 -digit number to submit a question,

the receiver address, the sender address, and the classification

completion status are stored in the DB and the sender

confirmation mail is linked to the server program which

classifies the mails. Asked to classify by the sender

confirmation mail, the classification program gets from the DB

the number of classification of the sender address completed on

the day, outputs a number checking quiz and an input field to

receive an answer, and executes th e classification only if the

answer is correct .

For example, a classification program is called by the

sender confirmation mail.

Bunbae . php?no=123&sender=hong@aaa. com&user=guy&msg=maill234 The classification program Bunbae. php retrieves from the DB

the num ber of completion of the classification asked by the

sender hong@aaa.com today as follows. SELECT * FROM reply_mail WHERE no='123' AND sender= ' hong@aaa . com' AND ok=l

In the above example, reply_mail is the DB table for the sender confirmation mail; sender is the address of the sender;

user is the receiver; ok is the field of classification

completion status. Since the value of ok ^Λl' means a success, if

the retrieved value is bigger than 1, the number quiz is

submitted.

FIG. 6 shows an example of computer exclusion process.

FIG. 6 is the case when the ' Bunbae. php ' program is called

by the sender confirmation mail, and depicts an example of the

challenge/response method in which a user reads the image number

and enters the number, which prevents the response by a computer.

This method is explained in the Background Art and not repeated

here . The operation process of the present invention will be

hereafter described with reference to the accompanying drawings.

FIG. 7 is a flow chart showing the operation of t he

invention .

When a new mail arrives S100, the automatic classification

address book is referred S200. If the address is in the address

book, the mail is transferred to the designated mailbox S210, or

the mail is delivered to the blocked mailbox immediat ely S300.

An identifier S400 is assigned to the mail, and a sender

confirmation mail containing the identifier is created and sent

to the sender immediately S500. When the sender confirms by selecting an item of the classification menu of the sender

confirmation mail S600, a server program is called to collect

the IP address of the person who opens the sender confirmation

mail and displays it on the screen of the opener of the sender

confirmation mail. When the classification confirm button of the

sender confirmation mail is pressed, the server program which

receives the confirmation releases the blocking of the mail and

moves the mail to the mailbox S700. The value received contains

identification and selected button value. If the sender selects

the Cancel button, the mail with the identification is deleted

immediately S610. The user opens the mail which is moved to the

mailbox S800, recognizes it being a spam -mail, presses the spam

report button to collect the necessary information from the

server log , creates the spam -mail report with the IP address

automatically, and submits it to the spam report center S900. According to the invention, all the spam sent by the

spammer who does not exposes current IP address can be deleted,

and the IP address of the spammer who sends the spam to the user

can be acquired and used as data for arresting the spammer. Even though the invention is implemented without an address

book or the menu in a sender confirmation mail which are used

for automatic classification, the e ffect to block an illegal mail such as a spam -mail or a mail containing a threat remains

same. The mail whose address is not in the receiver's address

book is blocked and a confirmation mail is sent to the sender to trace and display the IP address on the screen. An embodiment of

delivering only the mails of the sender who desires to deliver

the mail can be included in the present invention.

Industrial Applicability

As described above, the invention has an effect of blocking

the spam -mail since most of t he spammers do not receive reply

mails, an effect of driving spammers to give up by themselves

sending spam-mails by displaying the delivery refusal in advance

and the connection IP address which warns and threatens the

spammer, an effect of arresting the spammer by the simplified

spam-mail report process, and, as a result, an affect of

reducing the spam-mail.

In addition, contrary to the general spam -mail blocking

methods which tend to block excessively, the invention has an

effect of solving the excessive blocking problem clearly. While the present invention has been described with

reference to the particular illustrative embodiments, it is not

to be restricted by the embodiments but only by the appended

claims. It is to be appreciated that those skille d in the art

can change or modify the embodiments without departing from the

scope and spirit of the present invention.

Claims

What Is Claimed Is:

1. An email system comprising: a) an a utomatic classification address book means which

separates the sender addre sses in order to separately classify

normal mail and member newsletter; b) an automatic classification means which, when a new mail

arrives, automatically classifies the arrived new mail according

to the automatic classification address book by referring a

sender address, and automatically blocks the mail if the sender

address is not in the automatic classification address book; c) a sender confirmation means which automatically sends a

sender confirmation mail to the sender of the blocked mail (referred to as "an unconfirmed user") in such a way as to be

included in the mail or to be linked to a page in a server , the

sender confirmation mail containing information which explains

the intention of the sender confirmation mail , displays a sender

classification menu which contains selection items of mail

classification, and displays the intention to refuse the

delivery of a spam -mail, and including an unconfirmed user's IP

trace means which traces the current connection address of the

unconfirmed user; d) a bloc king release means which classifies the blocked

mail as a normal mail or a membership newsletter according to

the received classification value through the sender classification menu, moves the blocked mail to an assigned

mailbox, and adds the sender addre ss to the address book

automatically or by a user's confirmation; e) a unconfirmed user's IP logging means which logs the

current connection address of the unconfirmed user received from

the unconfirmed user's IP trace means; and f) a spam-mail reporting means which automatically includes

the unconfirmed user' s current connection address logged in the

unconfirmed user's IP logging means, in a spam-mail report, when

the user judges the mail moved to the mailbox by the blocking

release means as a spam -mail an d presses a spam -mail report

button.

2. The email system according to claim 1, further

comprising a current connection address display means which

displays and warns the unconfirmed user, who is going to send

the classification value through the sender c lassification menu,

the current connection address.

3. The email system according to claim 1, further

comprising : a) a personal authentication means; b) a newsletter sender automatic response program

authentication means; c) a newsletter sender automatic response means in which the program is authenticated by the newsletter sender automatic

response program authentication means , wherein, af ter the above

unconfirmed user passes the above authentication means, information about the above unconfirmed user aut henticated by

the above authentication means is sent to the server, thereafter

multiple sender confirmation mails are not open individually by

the browser and response automatically in a batch mode; d) a newsletter automatic blocking release means releases

the blocking of the corresponding mail when the batch response

is received from the newsletter sender automatic response means

and moves all the released mails to the newsletter mailbox; and e) a means to include the information of the authenticated

unconfirmed user automatically in the spam -mail report form,

when the user reads the newsletter and presses the spam -mail

report button.

4. The email system according to claim 3, wherein the

newsletter automatic blocking release means further comprises

adding the sender and reference mail addresses of the released

mail to the automatic classification address book automatically.

5. The email system according to from claim 1 to claim 4, further comprising computer exclusion means, in which, when a

specific uncon firmed user responses to a sender confirmation

mail predetermined number of times for a predetermined time, a person can respond, but a computer cannot, and the blocked mail is released only if the response is correct.

6. An email processing method comprising the steps of: a) generating an a utomatic classification address book

which separates the sender addresses in order to separately classify normal mail and member newsletter; b) when a new mail arrives, automatically classif ying the

arrived new mail ace ording to the automatic classification

address book by referring a sender address, and automatically

blocking the mail if the sender address is not in the automatic

classification address book; c) automatically sending a sender confirmation mail to the

sender of the blocked mail (from now on referred as unconfirmed

user) comprises in a way to be included in the mail or to be

linked to a page in a server: explaining the intention of the

sender confirmation mail; displaying a sender classification

menu which c ontains selection items of mail classification;

displaying the intention to refuse the delivery of a spam -mail;

and an unconfirmed user' s IP trace means which traces the

current connection address of the unconfirmed user; d) releasing a blocking which classifies the blocked mail

as a normal mail or a membership newsletter according to the

received classification value through the sender classification

menu, moves the blocked mail to an assigned mailbox, and adds the sender address to the address book automa tically or by a

user's confirmation; e) logging an uncon irmed user' s IP which logs the current

connection address of the unconfirmed user received from the

unconfirmed user's IP trace means; and f) generating spam -mail report which includes the

unconfirmed user' s current connection address logged in the

unconfirmed user's IP logging means to a spam -mail report, when

the user judges the mail moved to the mailbox by the blocking

release means as a spam -mail and presses a spam -mail report

button .

7. The ema il processing method according to claim 6,

further comprising a step of displaying a current connection

address which displays and warns the unconfirmed user, who is

going to send the classification value through the sender

classification menu, the current connection address.

8. The email processing method according to claim 6 and 7,

further comprising: a) a personal authentication step; b) a newsletter sender automatic response program

authentication step; c) a newsletter sender automatic response step i n which the

program is authenticated by the newsletter sender automatic response program authentication step , wherein, a fter the above unconfirmed user passes the above authentication step,

information about the above unconfirmed user authenticated by

the above authentication step is sent to the server, thereafter

multiple sender confirmation mails are not open individually by the browser and response automatically in a batch mode; d) a newsletter automatic blocking release step releases

the blocking of the corresponding mail when the batch response

is received from the newsletter sender automatic response step

and moves all the released mails to the newsletter mailbox; and e) a step to include the information of the authenticated

unconfirmed user automatica lly in the spam -mail report form,

when the user reads the newsletter and presses the spam -mail

report button.

9. The email processing method according to claim 8,

wherein the newsletter automatic blocking release step further

comprises adding the sender a nd reference mail addresses of the

released mail to the automatic classification address book

automatically.

10. The email processing method according to claim 6 to 9,

further comprising a computer exclusion step, in which, when a specific unconfirmed us er responses to a sender confirmation

11. An email system comprising: a) an address book means; b) a spam classification means which, when a new mail

arrives, delivers the mail if the sender address is in address

book, and blocks the mail if the sender address is not in

address book; c) a sender confirmation means which automatically sen ds a

included in the mail or to be linked to a page in a server , the

sender confirmation mail containing information which explains

the intention of the sender confirmation mail , displays a sender

classification menu which contains selection items of mail

classification, and displays the intention to refuse the

delivery of a spam -mail, and including an unconfirmed user's IP

trace means wh ich traces the current connection address of the

unconfirmed user; d) a blocking release means which moves the blocked mail to

the receiver' s mailbox according to the response received

through the sender response means, and adds the sender address

to the address book automatically or by a user's confirmation;

and person can respond, but a computer cannot, and the blocked mail

is released only if the response is correct .