Mail system and its program

Abstract

To provide an e-mail system that analyzes the details of incoming e-mails and displays a list showing that there are problems in the degree of emotion and the safety using icons to make it possible to grasp a sender's situation before opening individual incoming e-mails.SOLUTION: The mail system has a configuration in which a mail processing server 5 receives a mail sent from a sender's terminal 3 via a mail server 1, analyzes the received mail, determines the degree of safety of the received mail and the degree of emotion, etc., and displays icons indicating the degree of the sender's emotion, etc. and the degree of safety of the received mail on a screen displaying a list of received e-mails on a user terminal 2 of an e-mail recipient.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a mail system, and particularly to a mail system and its program that display the feelings of the sender of received mail while ensuring the security of received mail. [Background Art]

[0002] [Prior Art]<00000??>In conventional mail systems, various devices have been made to ensure the security of received mail. There is also one that changes the notification form according to the content of the received mail. [Related Art]

[0003] In addition, as related prior art documents, Japanese Patent No. 5064579 "Communication Device and Communication Method" (Patent Document 1), Japanese Unexamined Patent Application Publication No. 2011-130358 "E-mail System and..." (Patent Document 2), Japanese Unexamined Patent Application Publication No. 2011-237979 "Website Judgment Terminal,..." (Patent Document 3), Japanese Patent No. 4953461 "Spam Mail Judgment Server,..." (Patent Document 4), Japanese Unexamined Patent Application Publication No. 2003-234784 "Method for Blocking Junk E-mail and Receiving Server" (Patent Document 5), Japanese Patent Application Publication No. 2012-528528 "Management of Messages Potentially Phishing in the Context of Non-Web Mail Clients" (Patent Document 6), Japanese Patent No. 5000655 "Extended E-mail Folder Security" (Patent Document 7), Japanese Unexamined Patent Application Publication No. 2019-008727 "Relay Device and E-mail Relay Method" (Patent Document 8) exist.

[0004] Patent Document 1 describes that a communication device audibly notifies a received text message and analyzes the text message to change the notification form according to the degree of importance or the degree of sentiment. <? Patent Document 2 describes an e-mail system that has a transmission permission list and discriminates junk mail using a reverse DNS function.

[0005] It should be noted that there seems to be an incorrect tag "??" in line 13 which should be corrected to the correct 7 - digit tag if possible for a more accurate translation. Also, the "?" in line 27 is likely an error and should be a proper 7 - digit tag.Patent Document 3 describes a detection terminal that performs forward and reverse lookups of domain names against a DNS server to identify malicious websites. Patent Document 4 describes a judgment server that visually displays emails on a specific screen and identifies spam emails by comparing them with pre-stored visual patterns.

[0006] Patent Document 5 describes how a receiving server can return an email if the recipients of the email include a large number of unknown addresses, or if the addresses are not authorized to receive emails. Patent document 6 describes a service provider replacing the content of potentially phishing emails with a warning message and rewriting URLs.

[0007] Patent Document 7 describes how, if an email is determined to be spam or phishing, the URL may be hidden or disabled before display. Patent document 8 describes a relay device that opens a password-protected attachment, performs a virus check, and then opens the attachment. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Patent No. 5064579 [Patent Document 2] Japanese Patent Publication No. 2011-130358 [Patent Document 3] Japanese Patent Publication No. 2011-237979 [Patent Document 4] Patent No. 4953461 [Patent Document 5] Japanese Patent Publication No. 2003-234784 [Patent Document 6] Special Publication No. 2012-528528 [Patent Document 7] Patent No. 5000655 [Patent Document 8] Japanese Patent Publication No. 2019-008727 [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] However, the conventional email system described above had a problem: it did not analyze the content of received emails to understand the sender's emotions or the security of the received emails in order to improve work efficiency.

[0010] Furthermore, Patent Documents 1 to 8 do not describe a configuration that analyzes the content of received emails to understand the sender's emotions and the security of the received emails in order to improve business efficiency.

[0011] This invention has been made in view of the above circumstances, and aims to provide an email system and program that analyzes the content of received emails, displays icons indicating the degree of emotion and potential security issues, and allows users to understand the sender's situation before opening each received email individually. [Means for solving the problem]

[0012] The present invention, which solves the problems of the above-mentioned conventional example, is a mail system for sending and receiving emails, comprising a mail processing server that analyzes the text of an email sent from the sender's terminal, quantifies the state of a specific event, selects an icon corresponding to that quantification, and displays the email and icon in a list on the recipient's terminal's received email list screen. The mail processing server incorporates a code corresponding to the icon into the mail header or sender's name, converts that code into an icon and displays it on the recipient's terminal's received mail list screen, and when replying to an email containing the code received on the recipient's terminal, removes the code from the mail header or sender's name of the reply email. It is characterized by the following:

[0013] The present invention is characterized in that, in the above-mentioned email system, the specific event is the degree of the sender's emotions, the degree of accuracy of the document, or the degree of risk of the email.

[0014] In the above email system, the present invention is characterized in that the email processing server displays, for each email, a numerical value representing the degree of the sender's emotion, the degree of the accuracy of the document, or the degree of the risk of the email on the received email list display screen, or describes it in the email header of the received email.

[0015] In the above email system, the present invention is characterized in that when an icon displayed on the recipient's terminal is selected, the email processing server displays a numerical value representing the degree of the sender's emotion, the degree of the accuracy of the document, or the degree of the risk of the email.

[0018] In the above email system, the present invention is characterized in that when the link destination described in the email sent from the sender's terminal is a phishing site, the email processing server rewrites and invalidates the link.

[0019] In the above email system, the present invention is characterized in that when a file in ZIP format is attached to the email sent from the sender's terminal, the email processing server decompresses the file to check its security and notifies the recipient's terminal of the security.

[0020] A program that operates on an email processing server that processes the sending and receiving of emails, the program including means for analyzing the text of an email sent from the sender's terminal, means for quantifying, by the analysis, the state of the degree of the sender's emotion, the degree of the accuracy of the text document, or the degree of the risk of the email, and selecting an icon corresponding to the numerical value, The code corresponding to the icon is embedded in the email header or the sender's name, and the recipient's device converts that code into an icon on the received email list display screen. means for displaying in a list When replying to an email containing a code received on the recipient's device, the reply email must have a means to remove the code from the email header or sender's name. A program characterized by functioning these.

Advantages of the Invention

[0021] According to the present invention, for an email sent from the sender's terminal, the text of the email is analyzed to quantify the state of a specific event, an icon corresponding to the numerical value is selected, and there is an email processing server that displays the email and the icon in a list on the received email list display screen on the recipient's terminal. The mail processing server incorporates a code corresponding to the icon into the mail header or sender's name, converts that code into an icon and displays it on the recipient's terminal's received mail list screen, and when replying to an email containing the code received on the recipient's terminal, removes the code from the mail header or sender's name of the reply email.Since it is an email system, before opening individual received emails, On the list of received emails, by icon The sender's situation can be understood, Furthermore, the codes corresponding to those icons are removed from the reply email before it is sent, so the sender will not know about the codes, and emails can be sent and received without any issues. It has the effect of improving the efficiency of work. [Brief explanation of the drawing]

[0022] [Figure 1] This is a schematic diagram of the system's configuration. [Figure 2] This is an explanatory diagram showing how the list of received emails is displayed in this system. [Figure 3] This is a schematic diagram of another system. [Figure 4] This is an explanatory diagram showing how to display a list of received emails in another system. [Modes for carrying out the invention]

[0023] Embodiments of the present invention will be described with reference to the drawings. [Summary of the Embodiment] The email system according to an embodiment of the present invention (this system) has an email processing server that determines the security of received emails and the emotional state (degree) of the sender. When the email recipient (user) displays a list of received emails on their personal computer (user terminal), the degree of the sender's emotional state, the degree of security of the received emails, and the degree of accuracy of the documents are displayed in a list of icons. This allows the user to understand the sender's situation before opening individual received emails, thereby improving work efficiency.

[0024] Furthermore, this system automatically deletes received emails after a specified period, and the period for automatic deletion of received emails is changed depending on the level of security. This ensures that less secure received emails are deleted early, thus maintaining the security of the user's terminal that receives the email.

[0025] Furthermore, this system analyzes the content of emails sent from user terminals and displays an icon indicating the sender's emotional state before sending, thereby improving the quality of outgoing emails.

[0026] [This system: Figure 1] This system will be explained with reference to Figure 1. Figure 1 is a schematic diagram of the system's configuration. As shown in Figure 1, this system consists of a mail server 1 used by the user, a user terminal 2 owned by the user that sends and receives emails (hereinafter simply referred to as "mail"), and a sender terminal 3 that sends emails to the user terminal 2, all connected by a network 4. Furthermore, a mail processing server 5, which is a distinctive feature of this embodiment, is also connected to the network 4.

[0027] In this system, user terminal 2 and sender terminal 3 are connected to network 4 in multiple ways, and mail server 1 is also connected to network 4 in multiple ways depending on user usage.

[0028] In Figure 1, the mail processing server 5 provides webmail to the user terminal 2. Webmail displays sent and received emails in a browser, and the mail processing server 5 can design and configure the display of the email list, thereby improving convenience for the user terminal 2.

[0029] [Configuration of each part of this system] Next, we will explain the various parts of this system. [Mail Server 1] Mail server 1 is the mail server used by user terminal 2. It receives emails sent from sender terminal 3 and forwards them to mail processing server 5 according to the user's settings. Furthermore, mail server 1 forwards emails sent by user terminal 2 via mail processing server 5 to the terminal as the recipient.

[0030] [User Terminal 2] User terminal 2 sends and receives emails according to the web browser-based email (Webmail) screen provided by the email processing server 5. The email list displayed on this Webmail screen is distinctive. Details will be described later.

[0031] [Sender terminal 3] The sender terminal 3 sends emails to the user terminal 2. The emails are first received by the mail server 1 and then forwarded to the mail processing server 5, where the user terminal 2 receives the emails on the webmail screen provided by the mail processing server 5. [Network 4] Network 4 is the internet.

[0032] [Mail processing server 5] The mail processing server 5 is an information processing device equipped with a control unit, a memory unit, and an interface unit. Its distinctive functions are realized by the fact that processing programs stored in the memory unit are executed by the control unit. The processing performed by the control unit will be described later.

[0033] Furthermore, the memory unit stores email data sent and received by user terminal 2. The email data may also be stored in an external database. The interface unit is a connection unit for connecting to network 4.

[0034] [Processing details] The processing performed by the mail processing server 5 will now be described. This processing is carried out by processing means implemented in the control unit of the mail processing server 5.

[0035] [Forwarding of outgoing emails] In this system, when an email is sent from sender terminal 3 to user terminal 2, the email is received by mail server 1. In this system, users have configured their system so that emails received by mail server 1 are forwarded to mail processing server 5, and mail processing server 5 receives the emails forwarded from mail server 1.

[0036] [Security and sentiment assessment processing for forwarded emails] The mail processing server 5 determines whether the forwarded mail is spam or infected with a virus (spam / virus mail) and identifies the degree of security of the mail. Furthermore, for mail that is determined to have a low probability of being spam or a virus, it analyzes the mail body (mail content) and identifies the sender's emotional state (degree) or the degree of accuracy of the document. Furthermore, it is possible to perform spam / virus email detection and email body analysis simultaneously.

[0037] In terms of emotional state (degree of emotion), the results of analyzing the text content are used to determine the degree of emotion (satisfaction level) by classifying it into categories such as "very satisfied," "somewhat satisfied," "neutral," "somewhat dissatisfied," and "very dissatisfied" (angry).

[0038] The email processing server 5 then converts the level of security and the level of sentiment into icons, assigns these icons to the forwarded emails, and displays them on the user terminal 2's webmail screen. The icon design may be unilaterally determined by the mail processing server 5, or it may be possible to allow the user terminal 2 to select from multiple options.

[0039] The degree of accuracy of a document is determined by analyzing its content and classifying it into categories such as "easy to understand," "average content," "difficult to understand," "unclear," or "incomplete." Alternatively, the accuracy of a document may be determined by analyzing the sentence structure.

[0040] [Display of received email list on user terminal 2: Figure 2] Next, we will explain the screen displaying the list of received emails on user terminal 2, referring to Figure 2. Figure 2 is an explanatory diagram showing the screen displaying the list of received emails in this system. User terminal 2 displays a list of emails on the webmail screen provided by the mail processing server 5, as shown in Figure 2.

[0041] In Figure 2, tabs categorized as "All," "Safe," "Somewhat Safe," "Caution," "Dangerous," and "Spam" are displayed at the top of the email list, and the number of emails in each category is shown. Selecting a tab will selectively display emails belonging to that category.

[0042] Additionally, checkboxes are provided next to the tabs to select one or more of the above types. If you check multiple checkboxes, the selected email types will be displayed together.

[0043] Below the relevant tab, you will see the following items: "Spam," "Date," "Sentiment," "Title," "Delete," "Attachment," and "From." The "Spam" column indicates the likelihood (level of safety) that the email is spam or contains a virus, using a numerical value from "0" to "100". A lower number indicates higher safety, while a higher number indicates lower safety (higher level of risk). The "Date" field displays the date and time the email was received.

[0044] The "Emotion" section displays icons indicating the level of security and emotion as converted by mail processing server 5. Here, emotion and security are represented by face icons. These face icons are coded, and the icons are displayed using these codes. A smiling face icon indicates high satisfaction, while an angry face icon indicates high dissatisfaction. Regarding safety, high-risk incoming emails are represented by a spiky, virus-shaped face icon.

[0045] The "Title" field displays the title of the received email. The "Delete" option indicates the period (number of days) for which emails will be automatically deleted. The number of days can be set and changed by the user. Note that the deletion period is set shorter for emails with lower security. It is safer to automatically delete less secure incoming emails early. Alternatively, you can compress the emails to be deleted into a ZIP file and save it to user terminal 2.

[0046] The "Attachments" section displays the type of attachment if any files are present. For attached files, email processing server 5 performs a virus check, and in the case of ZIP files, it is configured to decompress them before performing a virus check. The "Sender" field displays the sender's email address, and if the email originates from a country deemed unsafe (either the country of origin or a transit country), a warning mark (note mark) will be displayed next to the sender's name.

[0047] Alternatively, the email lists categorized by tabs—"All," "Safe," "Somewhat Safe," "Caution," "Dangerous," and "Spam"—can be displayed in different colors for each received email.

[0048] [Group email function] Furthermore, in this system, if a web browser-based email client is used, a group email function can be incorporated that allows multiple people to use a single mailbox, and email sending and receiving may be handled on a group basis.

[0049] [Another system: Figure 3] Next, we will explain a different email system (another system) that is not a web browser-based mailer, referring to Figure 3. Figure 3 is a schematic diagram of the other system. Another system, as shown in Figure 3, has a configuration similar to Figure 1, but differs in the processing and display method for sending and receiving emails. The processing and display method are described below.

[0050] [Processing in another system] The process is the same as in this system until the outgoing email from sender terminal 3 is received by mail server 1 and then forwarded to mail processing server 5. The mail processing server 5 assesses the security and sentiment of the forwarded mail, obtains an icon code corresponding to the degree of sentiment, adds this code to the header or sender name of the forwarded mail, and sends it to the user terminal 2 via the mail server 1, where the user terminal 2 receives the mail from the sender terminal 3.

[0051] Furthermore, since emails received on user terminal 2 have an icon code attached, when replying to such an email, the mail processing server 5 removes the code before sending.

[0052] [Display of received email list on user terminal 2 in another system: Figure 4] Next, we will explain how to display the list of received emails on user terminal 2 in another system, referring to Figure 4. Figure 4 is an explanatory diagram showing the display of the list of received emails in another system. On user terminal 2, a face icon code is embedded before the email title to display the face icon before the title. Alternatively, you could embed the face icon code after the sender's information so that the face icon appears after the sender's information, rather than before the title.

[0053] However, unlike the webmail screen in Figure 2, emails are delivered from mail server 1, so tabs and checkboxes cannot be added, and it is not possible to display a numerical value for the email's risk level. Also, if the automatic email deletion function is available on user terminal 2, users will need to configure it individually in their email client. While other systems have fewer features compared to this system, they offer high convenience for users who are already using an email client, as it doesn't represent a significant change.

[0054] [Security measures] Furthermore, the mail processing server 5 of this system and other systems will perform the following security-enhancing processes. [Checking the country of origin and relay country of the email] The mail processing server 5 checks the country of origin and relay country of the mail. The check can be determined by the country where the IP address of mail server 1 is located, and if it is a country with a high volume of spam or phishing emails, a warning message will be displayed when the email is received on the user terminal 2. You may also add a caution mark ("Note") after the sender's information.

[0055] [DNS Reverse Lookup Check] Mail processing server 5 performs a reverse DNS lookup to verify whether the email address server is officially registered with the DNS server.

[0056] [Phishing site detection / link disabling] The email processing server 5 clicks on the URL of a link in the email, determines whether it is a phishing site or not, and if it is a phishing site, rewrites the URL of the link to disable it.

[0057] [Learning URLs] The email processing server 5 stores the URLs of the phishing sites identified above, learns from them using AI (Artificial Intelligence), and uses this information to make the same determinations. This improves the accuracy of the determinations.

[0058] [Virus check of attached files] If there is an attachment, the mail processing server 5 checks it for viruses, deletes it if it is a virus file, and notifies the user terminal 2. Additionally, if the attached file is in ZIP format, it will automatically decompress and perform a virus scan.

[0059] [Support for encrypted ZIP files] If the attached file is an encrypted ZIP file, the mail processing server 5 will automatically decrypt it using a pre-registered password (PW) from the user terminal 2, then run and extract the file to perform a virus check. If it is a virus file, it will be deleted and the user terminal 2 will be notified.

[0060] [Application Examples] [Other events] This system and other systems quantify the degree of danger in an email based on the email body and attachments, but it may also quantify and determine the degree of the sender's emotions and the degree of accuracy of the document, and display these values ​​for each email on the received email list screen. In addition to these specific degree of events, this system may also be applied to other degree of events such as the degree of conciseness of the writing and the degree of affection.

[0061] [Reflects the individual sender's situation] In this system and other systems, the degree of emotion, etc., is quantified from the body (text) of the email. Alternatively, the quantified data could be accumulated for each sender, a total score could be calculated, an average score could be obtained from that total, and the degree of emotion, etc., could be determined based on that average score. Furthermore, it is desirable to update the total score to the latest value by specifying a period, such as the past three months.

[0062] The method described above reflects the individual sender's situation, particularly their personality and habits, allowing for the detection of subtle emotional changes, such as when a normally calm person is angry, or when a normally blunt person is satisfied.

[0063] [Email response evaluation] In this system and the mail processing server 5 of another system, the degree of emotion is converted into an icon. When the degree of emotion is determined, "highly satisfied" is given a high score and "highly dissatisfied" is given a low score, and by aggregating these scores, the mail administrator can evaluate the user's mail handling, and furthermore, by analyzing the aggregated scores, it is possible to support the improvement of the user's work.

[0064] [Improved outgoing emails] By utilizing the emotion level determination function or document accuracy level determination function of the mail processing server 5 of this system and another system, the emotion level of the email to be sent from the user terminal 2 can be determined in advance, and the user can be prompted to improve the email to be sent.

[0065] [Write in the email header] In the above example, the mail processing server 5 was configured to add a code corresponding to the icon to the mail header before sending it. However, it would also be possible to include a numerical value for sentiment assessment and a numerical value for safety in the mail header to indicate the basis for the icon.

[0066] The email header can be viewed when the email source is displayed, and it contains detailed information about the email, specifically information such as the route and time of delivery, and the servers the email passed through. Furthermore, arbitrary information starting with "X-" can be added to the email header. For example, using an emotion detection program (emotion detection filter) can be indicated as "X-Emotion-Filter: Yes" and the result as "X-Emotion-Score: Numerical Value," while using a safety detection program (safety detection filter) can be indicated as "X-Doubt-Filter: Yes" and the result as "X-Doubt-Score: Numerical Value."

[0067] Emotion assessment result: The "X-Emotion-Score: numerical value" indicates that a low value means low satisfaction and high dissatisfaction, while a high value means low dissatisfaction and high satisfaction. These values ​​are calculated during the sentiment assessment process for forwarded emails. Furthermore, the security assessment result, "X-Doubt-Score: numerical value," indicates that a lower number means higher security, while a higher number indicates a suspicious email and lower security. These values ​​are calculated during the security assessment process for forwarded emails.

[0068] Here, we will explain specific examples of how to include sentiment and safety assessments in email headers. If the system passes the safety filter (doubt filter), write "X-Doubt-Filter: Yes," and below that, write, for example, "X-Doubt-Score: 40," followed by the safety score. Additionally, if the emotion filter is passed, write "X-Emotion-Filter: Yes," and below that, write the emotion values ​​(scores) in three types: positive score, neutral score, and negative score, for example, "X-Emotion-Score: 21.53, 1.33, 1.21." In this example, the score is calculated to two decimal places, but the number of decimal places to calculate is arbitrary.

[0069] By including numerical values ​​for the sentiment assessment and safety assessment in the email header, email recipients can refer to the email header to see the numerical values ​​that underpinned the icons representing the degree of sentiment and safety in the email.

[0070] In particular, even with a limited number of icon types, the descriptions can be made more detailed using numerical values. Specifically, if there are three safety hazard icons, a numerical value of "0" indicates safety with no hazard icons displayed, numerical values ​​of "1-3" display hazard icon 1, numerical values ​​of "4-6" display hazard icon 2, and numerical values ​​of "7-9" display hazard icon 3. In other words, you can get a general idea of ​​the situation from the icons, and then understand the details from the numerical values ​​in the email header.

[0071] [Touch the icon to display the numerical value] For forwarded emails, icons representing the sender's emotions and safety may be displayed. When the receiving user touches (or places the mouse pointer over) an icon on user terminal 2, a numerical value for the emotion rating or a numerical value for the safety rating may be displayed.

[0072] Specifically, by programming the forwarded email to be written in HTML (Hyper Text Markup Language) format and embedding numerical values ​​in the corresponding icons, the recipient user terminal 2 can select the icon to check either the emotion rating or the safety rating. In this case, you can include the numerical value in the email header, or you can choose not to include it in the email header and instead display the value only when an icon is touched.

[0073] Furthermore, the display of emotion icons and numerical emotion ratings in emails will allow managers to quickly recognize changes in employees' mental states in the increasingly common teleworking environment, and their use in sending and receiving emails within the company is expected to increase in the future.

[0074] [Effects of the embodiment] According to this system and other systems, the mail processing server 5 receives mail sent from the sender terminal 3 via the mail server 1, analyzes the received mail, determines the level of security and sentiment of the received mail, and displays the level of the sender's sentiment and security as icons when the received mail is displayed in a list on the recipient's user terminal 2. Therefore, the sender's sentiment and other conditions can be grasped at the list display stage before opening individual received mail, which has the effect of improving work efficiency.

[0075] Furthermore, in this system and the mail processing server 5 of another system, the degree of emotion is converted into an icon. When the degree of emotion is determined, "highly satisfied" is given a high score and "highly dissatisfied" is given a low score, and by aggregating these scores, mail administrators can evaluate users' mail handling, and by analyzing these scores, it is possible to support improvements in users' work.

[0076] Furthermore, by utilizing the sentiment assessment function of the mail processing server 5 of this system and another system, it is possible to pre-determine the degree of sentiment in an email that a user terminal 2 is about to send, and prompt the user to improve the email they are sending. [Industrial applicability]

[0077] This invention is suitable for an email system that analyzes the content of received emails, displays icons indicating the degree of emotional impact and potential security issues, and allows users to understand the sender's situation before opening individual emails. [Explanation of symbols]

[0078] 1…Mail server, 2…User terminal, 3…Sender terminal, 4…Network, 5…Mail processing server

Claims

1. A mail system for sending and receiving emails, The system includes a mail processing server that analyzes the text of an email sent from the sender's terminal, quantifies the state of a specific event, selects an icon corresponding to that quantification, and displays the email and the icon in a list on the recipient's terminal's received email list screen. The mail processing server incorporates a code corresponding to the icon into the mail header or the sender's name, converts the code into the icon and displays it on the recipient's terminal's received mail list screen, and when replying to an email containing the code received on the recipient's terminal, removes the code from the mail header or the sender's name in the reply email.

2. The email system according to claim 1, characterized in that the specific event is the degree of the sender's emotions, the degree of accuracy of the document, or the degree of risk of the email.

3. The mail system according to claim 2, characterized in that the mail processing server displays a numerical value for the degree of the sender's emotion, the degree of accuracy of the document, or the degree of danger of the mail for each mail on the received mail list display screen, or describes it in the mail header of the received mail.

4. The mail system according to claim 2, characterized in that when an icon displayed on the recipient's terminal is selected, the mail processing server displays a numerical value indicating the degree of the sender's sentiment, the degree of accuracy of the document, or the degree of danger of the mail.

5. The mail system according to claim 1 or 2, characterized in that the mail processing server rewrites and invalidates a link in an email sent from the sender's terminal if the link leads to a phishing site.

6. The mail system according to claim 1 or 2, characterized in that, when a mail processing server has a ZIP file attached to a mail sent from the sender's terminal, it decompresses the file to verify its security and notifies the recipient's terminal of that security.

7. A program that runs on a mail processing server that handles the sending and receiving of emails, A means of analyzing the text of an email sent from the sender's device, The analysis quantifies the degree of the sender's emotions, the degree of accuracy of the document, or the degree of danger of the email, and provides means for selecting an icon corresponding to the numerical value. A means of incorporating a code corresponding to the aforementioned icon into the email header or the sender's name, and converting that code into the aforementioned icon and displaying it in the list on the recipient's terminal's received email list screen, A program characterized by having a means for removing the code from the email header or the sender's name of the reply email when replying to an email containing the code received on the recipient's terminal.

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