WO2009021567A1

WO2009021567A1 - Method and apparatus for a safe communication between two or more computers

Info

Publication number: WO2009021567A1
Application number: PCT/EP2008/000417
Authority: WO
Inventors: Mikhail Kolobov
Original assignee: Mikhail Kolobov
Priority date: 2007-08-13
Filing date: 2008-01-21
Publication date: 2009-02-19
Also published as: WO2009021532A1

Abstract

The present invention relates to an apparatus and a method for a safe communication between two or more computers with avoidance of unwanted data of third parties, wherein the following steps are executed: Sending data, such as an email, from a first computer to a second computer; automatically entering the ID of the addressee in a 'white list' of the sender; quarantining the received data, such as the email, in a part of an inbox on the addressee side if the ID of the sender of the data of step a) is not listed in the 'white list' of the addressee; sending an automated response to the sender with a non-automatically readable code; identifying the response by the sender of the data of step a) and informing of the sender of the data of step a); manually creating a new code based on the code of step d) by the sender of step a); creating a reply to the addressee of step a) by the sender of step a) including a new code based on step f); sending the reply of step g) to the addressee of step a); automatically identifying the reply of step g) by the addressee of step a); and automatically informing the addressee of step a) of the reply of step g). Additionally, it is suggested to enter simultaneously addressed correspondents of emails from entrusted senders into the addressed correspondents' 'white lists'.

Description

Method and apparatus for a safe communication between two or more computers

The invention concerns a method for safe communication between two or more computers with avoidance of unwanted data of third parties. The invention also concerns a device for safe communication between two or more computers with avoidance of unwanted data of third parties. The invention further concerns a computer program product including one or more computer-readable media with computer-readable instructions for conducting the necessary steps for a safe communication between two or more computers with avoidance of unwanted data of third parties.

Business and private correspondence by means of email are widely known in modern society. A lot of communication, be it business related or private, is conducted with the use of computers. Such business-related and private correspondence include any kind of electronic messages and/or message services, e.g. plain emails, emails with attached data, sms (short message service), mms (multimedia message service), ire (internet rely chat) and/or VoIP (voice over ip).

Since communication between computers is very common and the accessibility of computers, e.g. via the internet, is widely known and almost everywhere possible, a problem arose in the last decades. More and more unwanted data is received by the recipients. A widely known problem is therefore the appearance of spam.

Spam may be defined as data which is unwanted by the recipients. Such spam in particular includes emails by third parties sent in high quantity to random addresses of potential recipients.

It is known that such spam may include viruses, worms or so called Trojans, thus the risk of endangering the integrity of the recipient's computer. Apart from this imminent danger, the recipient has to ensure that important data sent to him is not discarded. This consideration results in a loss of time, since all the data received has to be evaluated to find out which data is spam and which is not. On the one hand, there is a strong longing to discard such spam - e.g. spam emaii. On the other hand, it has to be made sure that data, which is not of the spam category, is not discarded and therefore does come to the attention of the recipient. A consequence of such unintended deletion of non-spam data results in high economic losses.

In the state of the art, a solution for this problem has been sought. It has been attempted to find solutions to avoid so-called spam, so it does not get the attention of the recipients and is deleted. It has also been attempted to find a solution against the unintended deletion of non-spam.

The United States patent application US 2003/009698 Al discloses a possible solution for this problem. The method and system for filtering spam is discloses in this document. Whenever a message is initially received from an unapproved sender, a confirmation request email is sent to the sender's email address, requesting the sender to confirm his existence and identity. Spammers, i.e. the senders of spam data, such as spam emails, typically do not receive reply emails and cannot handle these if they happen to arrive. Therefore, until the unapproved sender replies to the confirmation request email, electronic messages received from unapproved senders are treated as spam.

A list of approved senders is maintained by the spam filter. Electronic messages from those approved senders are not treated as spam and are immediately delivered to the user. Generally, a list of valid source addresses for one user is maintained either on the user's computing device or on a mail server, depending upon their specific application. The US document US 2003/009698 A1 also discloses the use of a "tunnel password" and a "CZID".

The document however does not address the problem which arises when both the sender and the recipient of the data have such a spam filtering device.

In this case, a user A sends for instance an email to B. This email is received in a quarantine part of an inbox of B. An automatic reply including the "CZID" is sent to A by B. If A is having the same spam filter as B according to US 2003/009698 A1, this new email is then again quarantined by A. A newly generated response upon the receipt of the reply will then again be quarantined by B. The resulting eternai ioop iteration can only be penetrated by manual interference by the users A and/or B.

Furthermore the document does not address the following problem: Lets assume a user, namely D, is listed in a list of approved correspondents of two users, namely E and F, respectively. This allows to regard E and F as being entrusted by D, and to regard D as being entrusted by E and F. If D sends an email which addresses E and F simultaneously and asks E and F to contact each other, those two users will need to perform a confirmation procedure in order to confirm their existence and/or identity. This procedure is obviously redundant as their existence and/or identity was already approved by user D, who in turn is entrusted by E and F respectively.

Related prior art is also disclosed in KR 1020040095008 A. Therein another method for filtering spam messages is disclosed.

A system for blocking spam emails and a method for blocking spam emails is further disclosed in WO 2006/129962 A1.

A first object of the invention is to avoid manual interference of the first recipient of the email or data. The monetary and time related resources of B shall be preserved. Only A shall have to interfere manually, so that his original message comes to the attention of B, without B's manual, i.e. direct interference, so that unwanted data, such as spam, does not come to B's attention.

A second object of the invention is to facilitate discarding of spam among two or more correspondents. Manual, i.e. direct interference, of two or more correspondents can hereby be completely avoided.

A solution for the above identified first problem is presented by using a method for a safe communication between two or more computers with avoidance of unwanted data of third parties with the steps of: a) sending data, such as an email / message, from a first computer to a second computer; b) automatically entering the ID (address) of the addressee in a so-called "white list" of the sender of step a); c) quarantining the received data, such as the email, in a part of an inbox on the addressee-side if the IO of the sender of the data of step a) is not listed in the "white list" of the addressee; d) sending an automatic response from addressee to the sender with a non-automatically readable code (test message); e) automatically identifying a response step d) by the sender of step a) and informing the sender of data of step a); f) manually creating a new code based on the code of step d) by the sender of the data of step a); g) creating a reply to the addressee of step a) by the sender of step a), including the new code of step f); h) sending the reply of step g) to the addressee of step a); i) automatically identifying the reply of step g) by the addressee of step a); and/or j) automatically informing the addressee of step a) of the reply of step g).

By an ID, any sort of ID is comprised. The e-mail address of the sender of an email may be such an !D.

By this method, a user does not get emails from unknown persons, as long as such persons have not verified that they are real human and not some kind of machine that manually replies on the automatic response. The automatic reply is brought to the attention of the sender of the initial email, so that after a very short time the originally sent email may be brought to the attention of the original recipient in the later process, as intended by the original sender. As long as the authentication of the original sender has not been verified by the automatic system installed at the original recipient's side, the originally sent email will not be brought to the attention of the original recipient. The first recipient does not have to waste time or resources on spam. The original sender exerts influence on the receipt of the original email due to his manually created response, so that it comes to attention of the originally intended recipient, unless this is explicitly not wanted by the recipient.

Favourable solutions are claimed in the dependent claims.

In between the quarantining of the received data, such as the email, in a part of an inbox on the addressee-side and the sending of an automated response to sender of a non-automatically readable code, the quarantined data, e.g. the email, is deleted during such an intermediate step. It is thereby avoided that the quarantined part of the inbox is stuffed by to much unwanted data. The quarantined data is deleted depending on the storage time in this part of the inbox and/or the amount of data in this inbox. Any emails which are too old are therefore deleted after a certain time period, preferably if no response or wrong response is received.

It is advantageously avoided that the originally sent data is irrevocably lost, if a request to resend the data of step a) is included in the automatic response of step d).

To avoid the receipt of the data of a known sender of spam for good, it is advantageous if the IDs of certain senders are entered in a so-called "black list". Comparing the ID of the senders to the IDs listed in the respective "black list" results in that data of known spammers can be easily found and deleted, so that such data is not brought to the attention of the recipient. It is therefore an advantage, if the data sent by senders with IDs included in the "black list" is deleted. However, manual interference is avoided if the deletion of such unwanted data is automatically conducted before step c).

If, upon step j), the ID of the sender of data is automatically entered in a so called "white list", future emails can be directly brought to the attention of the recipient without the need for a prior test procedure with the automated reply and non- automated response.

When the ID of the sender of data is automatically compared to the IDs included in the "white list" and the data is brought to the direct attention of the addressee of step a), time can be economized. It has to be made sure that data, which is not of the spam category, is not discarded and therefore does come to the recipient.

It provides an additional advantage if an additional filtration of incoming messages is made before the data is brought to the direct attention of the addressee of step a), depending on results of a filtration data can automatically be deleted, kept in a special folder or inform the addressee of step a).

It is advantageous if a method is used wherein information about sent messages are kept in a temporary folder for a certain time and are used in the following for the analysis of arriving messages concerning the notification of failed delivery, wherein delivery failure messages are either removed or delivered to the initial sender of data, if expressly wished and wherein the automatic response is consequently not sent to avoid another rebounce.

It is advantageous if the automated response of step d) can be repeatedly sent. Repeated sending of the automated response of step d), such as the test message, can be conducted in reply to the incorrect answer to the test message and/or after a set time interval after non-receipt of a response on the test message.

The second object is solved by a method for automatic allocation of a "white list" among entrusted users. To this purpose, all or selected IDs of simultaneously addressed correspondents in a received email from an entrusted sender, i.e. a sender whose ID is already listed in the "white list" of the receiver, are entered, preferably automatically, into the receiver's "white list". In other words, further addressees additionally addressed in an email which a receiver receives from an entrusted sender, are defined as entrusted senders themselves and put into the "white list" accordingly.

In this way, "white lists" of entrusted senders can be spread and multiplied easily. Since a sender only can come into a "white list" of a correspondent in this way if he his addressed by an entrusted sender (and therefore cannot be a spammer), at the same time the "white lists" are secured against infiltration of spammer IDs. In a simple example, if sender D sends one email to receivers E and F in parallel, comprising both IDs of E and F in this email, receiver F recognizes parallel receiver E as entrusted sender since E is addressed in an email received from entrusted sender D. Vice versa receiver E puts F's ID into his "white list" due to the fact that this ID is comprised in an email sent by the entrusted sender D.

This method advantageously may be combined with the method discussed above to create or expand such "white lists". Nonetheless, it may be performed without this specific way of identifying spammers and entrusted senders respectively, i.e. may be applied to all kinds of "white lists" which in general indicate IDs of email and/or data senders, who are supposed to be non-spammers. Such "white lists" may be created either manually or automatically. It is advantageous to determine a maxima! storage time for the automatically entered IDs of the correspondents, so that after its expiration the IDs are, preferably automatically, deleted from the receivers "white list" if there is no message and/or mail and/or email traffic between the receiver and the respective correspondents.

Alternatively, all or selected IDs of simultaneously addressed correspondents in a received email from an entrusted sender, i.e. a sender whose ID is already listed in the "white list" of the receiver, are entered, preferably automatically, into a "grey list" of the receiver.

Also messages from correspondents whose IDs are comprised in such a "grey list" are directly delivered to the receiver as are messages from correspondents whose IDs are comprised in the "white list". However, while correspondents whose IDs are comprised in the "white list" can act as entrusted correspondents, correspondents whose IDs only are comprised in the "grey list" cannot.

In a preferred embodiment, addressees who are simultaneously addressed by entrusted correspondents, are entered into the receiver's "grey list" so that emails from such simultaneously addressed correspondents are directly delivered to the receiver. However, addressees who are simultaneously addressed by non-entrusted correspondents whose IDs only are comprised in the "grey list", are not entered into the receiver's "grey list".

Preferably, IDs can be transferred from the "grey list" into such "white list" manually or by sending an email to such correspondent.

The object of the present invention can also be solved by a device for safe communication between two or more computers with avoidance of unwanted data of third parties. A device for sending data, such as an email, from a first computer to a second computer; a device for automatically entering the ID of the addressee in a "white list" of a sender if the ID of the sender of the original data is not listed in the "white list" or "grey list" respectively of the addressee; a device for quarantining the received data, such as an email, in a part of an inbox on the addressee-side; a device for sending an automated response to the sender with a non-automatically readable code; a device for automatically identifying the response by the sender of the original data and informing the original sender; a device for manually creating a new code based on the code in the response; a device for creating a reply to the original addressee including the new code; a device for sending the reply to the original addressee; a device for automatically identifying the reply through the original addressee; a device for automatically informing the original addressee of the reply; and/or a device for, preferably automatically, entering the IDs of simultaneously addressed correspondents in an email received from an entrusted sender into the receivers "white list" or "grey list"; and a device for, preferably automatically, deleting the entered IDs of the correspondents from the receivers "white list" or "grey list" respectively after the expiration of the determined maximal storage time if there is no email traffic between the receiver and the respective correspondents.

Such a device includes the necessary means to integrate the necessary steps in a technical entity, such as a computer.

The objects of the invention are also solved by a computer program product including one or more computer readable-media with computer-readable instructions for conducting their steps according to the previously described methods, if run on a computer.

In the following, the invention will be described with the help of some figures. The figures show the following:

Fig. 1 discloses a schematic flow of operation during sending, responding and replying between the two users, namely user A and user B,

Fig. 2 discloses a schematic flow of operation between a sender of spam, namely user C, and user B,

Fig. 3 discloses a schematic flow of operation during sending a non-spam mail from a user, namely user D , to two other users, namely user E and user F and the allocation of Ds "white list" to users E and F. Fig. 1 discloses a schematic view of a computer of a sender of data, namely user A and a schematic view of a computer of a user receiving data, namely user B. A will be referred therefore to as a sender and B will be referred to as addressee or recipient. The computers of A and B comprise the necessary programs for exchange of data, especially programs to send, receive and manage emails with or without attachments, such as data clusters.

Both computers comprise an entity, in which the data, such as emails, is received. This entity will be referred to as "inbox". The "inbox", the entity in which emails are received, is partitioned in a "quarantine inbox", a "trash inbox" and a "user-direct accessible inbox". Only messages in the "user-direct accessible inbox" can be seen by the user A or B in the respective inbox of the respective computer.

Both computers store and manage a so called "white list" and a so called "black list".

It is possible that only the computer system of the user B has these three lists and partitions the inbox in the "user-direct accessible inbox", the "trash inbox" and the "quarantine inbox". In the current case, shown in figure 1 , both systems of A and B are identical in this respect, however.

Both users A and B employ the system according to the invention, especially a method according to the invention, the device and the computer program product, to avoid the receipt of spam emails and to be notified of emails of some importance, sent by non-spammers. As a spammer, such a user is defined, who sends so-called spam emails to other users.

In Fig. 1 a special case is shown, where A, being the sender of information, is not a spammer, but intends to reach B, also being a non-spammer.

As a first step, namely step a), A sends an email to B with a certain content.

B has so far not entered the ID of A in any of his lists, namely the "white list", the "black list". If emails of senders being listed in the "white list" are received, these emails are directly put in the "user-direct accessible inbox", so that the user can read them immediately.

Emails and data of senders having their ID listed in the "black list" of B, will be led directly to the "trash inbox" and they are there either deleted directly, deleted after a certain period of time or deleted when the data reaches a certain threshold.

Due to the ID of A not being listed in any of the lists of B, the email of A is entered in the "quarantine inbox" as a step c). Before step c) or parallel to it, the ID of B is entered in the "white list" of the user A in a step b).

As a result of the email of A being entered in the "quarantine inbox" of B in step c) an automated response is generated and sent per email to A in the next step, namely step d). In this reply email, a code is included in this response. The code is, in the current embodiment, a picture showing a symbol or showing letters. The code, namely the picture, is created automatically by the system of B upon receipt of the email of a still unknown sender.

The response email of step d) is entered in the "user-direct accessible inbox" of A in a step e). This is due to the fact that the ID of the sender of the response, namely the ID of B, was entered in the "white list" before step d), namely in step b).

In the response, the automatically created code cannot be identified and further processed by means of a machine alone, but needs human mental abilities to be deciphered.

The reply of the embodiment of Fig. 1 sent in step d) also has a request included, to either resend the original email of step a) together with a response to B or either respond to B without resending the original email. However, in both cases, the code of the reply have to be integrated in the response. In step f), a new code is generated by the user A, by manual means. This may be such that the symbol is now described in a word or the letters included in the picture, possibly a .gif or a .jpg, and now entered in plain text. Anyhow, in step g), the response email is created and the code of the reply email of step d) is entered.

In step h), the response is forwarded to B.

On the side of B, in step i), the new code is then compared to the code included in the response email. If they correspond to each as expected, a positive output value is created.

As a result, in step j), the response email is now entered in the "user-direct accessible inbox", so that the user B can see it and access it directly. Therefore, only emails of senders of human nature can be entered in the "user-direct accessible inbox", as automated sending machinery cannot decipher the response and cannot generate automatically a reply, which meets the criteria of step d). This is especially efficient in such cases, where spammers use automated programs with no inbox at all.

Even human senders of spam cannot reach B, if they are listed in the "black list" of B. The receipt of spam emails by B will, therefore, be considerably minimized.

The effort of B for identifying automated spam emails stays consequently very low. On the other side, the user A needs only a minimum of effort to send response with or without his original message in which he enters a new code received in the automatic response of user B (test mail).

In a variant, the original email sent in step a) is deleted after being saved in the "quarantine inbox" for a certain time or until the "quarantine inbox" reaches a data amount above a pre-defined threshold.

Fig. 2 shows the fate of an email sent by a spammer, namely user C, to the user B. The ID of C is already listed in the "black list". In step a), the spammer sends an email to B. This email is automatically entered in the "trash inbox" during step b). In step c), the deletion of the spam email follows. This deletion can be done manually or automatically. An automated deletion can depend on the factor time or on the factor data content in the "trash inbox".

Information about sent messages are kept in a temporary folder on the computer or server of user A and B. This information are used to identify arriving emails concerning the notification of failed delivery. The case of user A for receiving messages shall be detailed further:

After user A sent message to B only three opportunities exist to receive messages for user A, namely

1} the answer of B or the test message of the user B,

2) receipt of a delivery failure message in reply to the sent message to the user B, or

3) the receipt of a message, an unknown correspondent C.

A method with different possibilities is the consequence:

1) Sending a message from user A to user B;

2) automatically entering the ID of the B in a "white list" of user A;

3) keeping the information about message of the first step in a temporary folder;

4) if user A receives any message, this message is analysed on the basis of information step 2, if the ID of the sender can be found in the "white list", which can be the answer of user B or the test message of the user B, whereupon it is shown to the user A, whereby the user A answers the message now manually, whereby the information about this new message is also kept in a temporary folder; or

5) if the analysis of step 4) is negative, the incoming messages analysed on the basis of the information of step 3), whereupon the user A is informed by any means of the non-delivery of the message to the user B, whereby no automatic information is sent to the user B, as this would be useless as the user B cannot receive messages of the user A, be it temporarily or not; and/or 6) if the analysis of steps 4) and 5) is negative, a message from an unknown person C is quarantined and the response (test mail ) is sent automatically,

7) information about response step 6) also are kept in temporary folder of user A;

8) next incoming message is again analysed, if the ID is present in the "white list", whereby the "white list" contains the ID of the user B, but does not contain the ID of the user C and if the analysis is positive, it is the reply is identified as answer or the test message of the user B₁ which is then presented to the user A, whereby this step is similar to the step 4); and/or

9) if the result of the analysis of step 8) is negative, the incoming message, i.e. the reply is analysed on the basis of the information of step 3) and the user A is informed by a means concerning the non-delivery of the message to the user B, whereby this step is similar to the step 5);

10) whereby additionally upon a negative result of the analysis of step 9), the incoming reply is analysed on the basis of the information of step 7), to the effect that the user C is defined as a spammer, whereby it is not necessary to inform the user A about it, as it is one of the purposes of the invention to protect the user A from spam messages, whereupon the spam message of user C is then deleted from the quarantine inbox;

11) whereupon additionally if a negative result of the analysis of step 10) results, the incoming message is analysed on the basis of the information of step 6), so that a response of the user C on the test message can be generated, if a correct answer is received, so that a message of user C, which is kept in the quarantine inbox is shown to the user A, or, if the answer is incorrect, it is concluded that the user C is a spammer, whereupon the message is deleted.

A comparable process is conducted for user B. The above detailed methods take care of the case that a iyping error in the response occurs. Also the situation is possible, e.g. because of temporary failure of a post server when the sender of an initial email will not receive a first test message. An automatic response, defined as a test message, can be repeatedly sent. Repeated sending of the test message can be conducted in reply to the incorrect answer to the test message and/or after a set time interval after non-receipt of a response on the test message.

Fig. 3 discloses a schematic view of a computer of a sender of data, namely user D and a schematic view of two computers of users receiving data, namely user E and user F. Therefore D will be referred to as a sender, and E and F will be referred to as addressees or recipients. The computers of D, E and F comprise the necessary programs for exchange of data, especially programs to send, receive and manage emails with or without attachments, such as data clusters.

Each of the three computers store and manage a so called "white list" and/or a so called "black list", to which IDs of entrusted senders and identified spammers may be entered for example as explained before with respect to Fig. 1 and Fig. 2.

In Fig. 3 a special case is shown, where D, being the sender of information, is not a spammer, but intends to reach E and F simultaneously, who in turn are non- spammers as well.

Initially, the "white list" of user D contains the IDs of user E and user F. The "white lists" of users E and F both contain the ID of user D.

In a first step, namely step a), D sends an email with a certain content to E and F simultaneously. Thus the email not only contains user E as addressee, but also specifies F as a second addressee, for example as "CC" (carbon copy), "BCC" (blind carbon copy), or as an equivalent addressee. Due to the ID of D being listed in the "white list" of E as well as in the "white list" of F, the email of D is entered, as a step b), into the "user-direct accessible inbox" of E and F respectively.

After step b) or parallel to it, the IDs of the addressees determined in the received email of step b) are automatically entered, as a step c) into the "white list" of each addressee. Consequently, if E will send an email to F, or F will send an email to E, these emails will pass without any delay and will not demand any additional direct interference either from E or from F.

After step c) or parallel to it, a maximal storage time for the entered IDs of step c) is determined in a step d). If E does not send any email to F within this user- specified or predetermined time period, the entered ID of F of step c) will be removed from his "white list" after the expiration of the maximal storage time. If E sends an email to F, the ID of F is kept in his "white list" permanently. Same applies vice versa for F sending or not sending emails to E and removal of E's ID from F's "white list" respectively. Thus only such IDs are permanently kept in a correspondent's "white list" to whom he at least once has send an email.

In an alternative embodiment, it may be sufficient if either E or F sends an email to the other one to keep their IDs in their "white lists" respectively. I.e., F's ID will be kept in E's "white list" if E sends or receives any email to F within this user- specified or predetermined time period In both embodiments, an overflow of the "white lists" can be impeded.

In a yet alternative embodiment, after step b) or parallel to it, the IDs of the addressees determined in the received email of step b) are automatically entered, as a step c) into a "grey list" of each addressee. Consequently, if E will send an email to F, or F will send an email to E, these emails will pass without any delay and will not demand any additional direct interference either from E or from F.

In contrast to the embodiment discussed before, E and F cannot act as entrusted correspondents however, as they can when comprised in the "white list". In particular, now when F sends an email to E and simultaneously to G and H, then - in the yet alternative embodiment - G's and H's iDs are not entered into E's white list since F is no entrusted correspondent (whose ID would be comprised in the "white list" of E), but whose ID only is comprised in the "grey list". In contrast, if F's ID were entered into E's "white list" instead of "grey list", then F could act as an entrusted correspondent and G's and H's IDs would be entered into E's white list due to G and H being simultaneously addressed.

In such way, an uncontrolled population of E's "white list" can be avoided.

Preferably, E can transfer F's ID from his "grey list" into his "white list" either manually or by sending an email to F. Of course, the same applies to F's "white list" and "grey list" respectively.

Claims

1. Method for a safe communication between two or more computers with avoidance of unwanted data of third parties, with the following steps:

a) Sending data, such as an email, from a first computer to a second computer;

b) automatically entering the ID of the addressee in a "white list" of the sender;

c) quarantining the received data, such as the email, in a part of an inbox on the addressee side if the ID of the sender of the data of step a) is not listed in the "white list" of the addressee;

d) sending an automated response to the sender with a non-automatically readable code;

e) identifying the response by the sender of the data of step a) and informing of the sender of the data of step a);

f) manually creating a new code based on the code of step d) by the sender of step a);

g) creating a reply to the addressee of step a) by the sender of step a) including a new code based on step f);

h) sending the reply of step g) to the addressee of step a);

i) automatically identifying the reply of step g) by the addressee of step a); and

j) automatically informing the addressee of step a) of the reply of step g).

2. Method according to claim 1 , wherein, as an intermediate step c) - between the steps c) and d) - the quarantined data, e.g. the email, is deleted.

3. Method according to claim 2, wherein the data is deleted dependent on the storage time in the relevant part of the inbox and/or the amount of data in this part of the inbox, wherein the data of step c) is received.

4. Method according to claim 3, wherein in the response of step d) a request to resend the data of step a) is included.

5. Method according to one of the claims 1 to 4, wherein the ID of senders is entered in a so-called "black list".

6. Method according to claim 5, wherein the data sent of senders with ID included in the "black list" is deleted.

7. Method according to claim 6, wherein the step of claim 6 is automatically conducted before step c).

8. Method according to one of the claims 1 to 7, wherein after step j) the ID of the sender of data is automatically entered in a so-called "white list".

9. Method according to claim 1 to 8, wherein the ID of the sender of data is automatically compared to the IDs included in the "white list" and the data is brought to the direct attention of the addressee of step a).

10. Method according to one of the claims 1 to 9, wherein an additional filtration of incoming messages is made before the data is brought to the direct attention of the addressee of step a), depending on results of a filtration data can automatically be deleted, kept in a special folder or inform the addressee of step a).

11. Method according to one of the claims 1 to 9, wherein automated failure of delivery is identified, whereupon no reply according to step d) is sent.

12. Method according to one of the claims 1 to 11 , wherein information about test emails and emails sent by the sender of the original data are kept in a temporary folder for a certain time and are used in the following for the analysis of arriving emails concerning a notification of failed delivery, wherein delivery failure messages are either removed or delivered to the initial sender of data, if expressly wished and wherein the response of step d) is consequently not sent.

13. Method according to claim 1, wherein the automated response of step d) can be repeatedly sent.

14. Method for a safe communication between two or more computers with avoidance of unwanted data of third parties, in particular according to one of claims 1 to 13, wherein the IDs of simultaneously addressed correspondents of a received message and/or mail and/or email from an entrusted sender are, preferably automatically, entered into "white lists" of the respective receivers, said "white lists" compromising IDs of entrusted senders, or into a "grey list" of the respective receivers, said "grey lists" compromising IDs of senders whose messages and/or mails and/or emails are delivered to the receiver, but who are not entrusted otherwise.

15. Method according to claim 14, wherein the entered IDs of the correspondents are deleted after a predetermined storage time if there is no message and/or mail and/or email traffic outgoing and/or ingoing between the receiver and the respective correspondent.

16. Device for a safe communication between two or more computers with avoidance of unwanted data of third parties comprising:

a device for sending data, such as an email, from a first computer to a second computer;

a device for automatically entering the ID of the addressee in a "white list" of the sender; a device for quarantining a received data, such as the email, in a part of an inbox on the addressee side if the ID of the sender of the original data is not listed in the "white list" of the addressee;

a device for sending an automated response to the original sender with an automatically non-readable code;

a device for automatically identifying the response by the original sender of the data, and informing of the original sender data;

3 device for manually creating a new code based on the code of the automatically non-readable code by the original sender of data;

a device for creating a reply to the original addressee, sending the data from a first computer to a second computer, including a new code which was manually created;

a device for sending the reply to the original addressee;

a device for automatically identifying the reply by the addressee of the original data being sent;

a device for automatically informing the addressee of the original data sent;

17. Device, in particular according to claim 16, comprising: a device for, preferably automatically, entering the IDs of simultaneously addressed correspondents in a received email from an entrusted sender into respective "white lists" or "grey lists" of the receivers.

18 Device according to claim 17, comprising: a device for, preferably automatically, deleting the entered IDs of the correspondents from the respective "white lists" or "grey lists" respectively of the receivers after the expiration of the determined maximal storage time if there is no email traffic between the respective receiver and the respective correspondents.

19. A computer program product including one or more computer-readable media with computer-readable instructions for conducting the steps of a method according to one of the claims 1 to 15, if run on a computer.