Outgoing email check system, check data providing apparatus, check data inspecting apparatus, and outgoing email check method

A check data inspecting apparatus included in an outgoing email check system including a security check executing apparatus that acquires a planned outgoing email to be transmitted to an email transmitting apparatus and executes a security check process for the acquired planned outgoing email, the check data inspecting apparatus comprising:

• a memory that stores
• sender-by-sender check information, which is received from a check information management apparatus, including an arbitrary value allocated to a sender,
• inspection check information including policy version information indicating content of the security check process to be executed for the planned outgoing email, and
• transmission rejection information indicating a planned outgoing email for which a transmission is rejected;
• and
• a processor to execute
• acquiring the planned outgoing email from the email transmitting apparatus, the planned outgoing email undergoing a security check process based on a predetermined policy version of security management, and including check data generated by a security check executing apparatus,
• extracting the check data including a check value generated from the arbitrary value allocated to the sender of the planned outgoing email from a header of the acquired planned outgoing email,
• inspecting the extracted check data by evaluating the extracted check data in accordance with both the sender-by-sender check information and the inspection check information,
• determining permission or rejection of the transmission of the acquired planned outgoing email based on a result of the inspecting,
• returning the acquired planned outgoing email to the email transmitting apparatus when a permission of the transmission of the acquired planned outgoing email is determined, and
• generating transmission rejection information of the acquired planned outgoing email and recording the transmission rejection information in the memory when a rejection of the transmission of the acquired planned outgoing email is determined.

An outgoing email check method to inspect the execution of a security check process for a planned outgoing email, the outgoing email check method executed by a first computer and a second computer,

• the first computer including:
• a memory that stores sender-by-sender check information, which is received from a check information management apparatus, including an arbitrary value allocated to a sender, and
• the second computer including:
• a memory that stores
• the sender-by-sender check information received from the check information management apparatus, and
• inspection check information including policy version information indicating content of the security check process to be executed for the planned outgoing email, the sender-by-sender check information and the inspection check information being received from the check information management apparatus;
• and
• transmission rejection information indicating the planned outgoing email for which a transmission is rejected,
• the outgoing email check method comprising:
• acquiring, using the first computer, a planned outgoing email to be transmitted to an email transmitting apparatus,
• executing, using the first computer, a security check process based on a predetermined policy version of security management for the acquired planned outgoing email;
• generating, using the first computer, check data including a check value generated from the arbitrary value allocated to the sender of the planned outgoing email based on the sender-by-sender check information stored in the memory of the first computer;
• appending, using the first computer, the generated check data to a header of the planned outgoing email for which the security check process is executed;
• transmitting, using the first computer, the planned outgoing email with the appended check data to the email transmitting apparatus;
• acquiring, using the second computer, the planned outgoing email from the email transmitting apparatus;
• extracting, using the second computer, the check data from the header of the acquired planned outgoing email;
• inspecting, using the second computer, the extracted check data based on the inspection check information stored in the memory of the second memory and determining permission or rejection of the transmission of the acquired planned outgoing email based on a result of the inspecting;
• returning, using the second computer, the acquired planned outgoing email to the email transmitting apparatus when the permission of transmission of the acquired planned outgoing email is determined;
• and
• generating, using the second computer, transmission rejection information of the acquired planned outgoing email and recording the transmission rejection information in the memory of the second computer when the rejection of the transmission of the acquired planned outgoing email is determined.

A non-transitory computer-readable medium storing a check data inspection program included in an outgoing email check system to inspect the execution of a security check process for an outgoing email, the check data inspecting program causing a computer including a memory to execute a process comprising:

• acquiring a planned outgoing email from an email transmitting apparatus;
• extracting check data from a header of an acquired planned outgoing email;
• inspecting the extracted check data by evaluating the check data in accordance with both sender-by-sender check information and inspection check information;
• determining permission or rejection of a transmission of the acquired planned outgoing email based on a result of the inspecting;
• returning the acquired planned outgoing email to the email transmitting apparatus when the permission of the transmission of the acquired planned outgoing email is determined;
• and
• generating transmission rejection information of the acquired planned outgoing email and recording the transmission rejection information in the memory when the rejection of the transmission of the acquired planned outgoing email is determined,
• wherein the memory stores
• the sender-by-sender check information, received from a check information management apparatus, including an arbitrary value allocated to the sender,
• the inspection check information including policy version information indicating the content of the security check process to be executed for the planned outgoing email, and
• the transmission rejection information indicating the planned outgoing email for which the transmission is rejected, and
• wherein, upon generation, the check data includes a check value generated from the value allocated to the sender of the planned outgoing email.