The T-Spam filtering service of Korea Internet Security Agency (KISA) blocks the spamming of websites and email addresses with an intelligent method. KISA uses machine learning technology, which helps it identify spam in real time. Besides, it allows users to change the blocking/allowing settings themselves, and supports a notification function for those who want to receive messages from the blocked numbers or addresses.

In addition, the T-Spam filtering service supports the function of blocking the number of spam messages. Users can check the number of spam messages that have been blocked, and restore or delete the messages they need. It also allows users to register or delete the numbers that have been blocked, blocking phrases, and blocked station numbers, and messages containing the blocked numbers or phrases are additionally blocked.

Through the blocking setting function, it is possible to set up the blocking/allowing settings for messages from your acquaintances. It is also possible to register or delete the allowed numbers and permitted phrases, and set up the blocking of messages from the numbers in your address book.