| 摘要 |
PROBLEM TO BE SOLVED: To appropriately limit information to be transmitted while maintaining convenience when transmitting electronic mail while attaching a file thereto.SOLUTION: When a transmission request of electronic mail including a destination is received, a mail server 200 transmits the electronic mail to the destination. The mail server 200 determines whether attachment is included in the transmission request of the electronic mail and, when it is determined that an attached file is included, transmits the file to the destination according to a technology improving security in accordance with a combination of a security level corresponding to the destination and a security level of the attached file. |
