Obtained patent for "TLS Confirmation Function" that fundamentally solves the PPAP problem.

Qualitya Corporation (Headquarters: Chuo-ku, Tokyo; President: Masayuki Murakami; hereafter "QualityA") announces that its "TLS Confirmation Function," a secure method for sending attachments, has been granted a patent (Patent No. 7802377) related to e-mail transmission systems.

The "TLS Confirmation Function" checks whether the receiving mail server supports TLS (Transport Layer Security) encrypted communication and also allows sending attached files without passwords. It is a standard feature of our cloud-based e-mail error prevention service "Active!gate SS" and our on-premise (in-house operated) e-mail error prevention product "Active!gate".

TLS Confirmation Function

The use of TLS communication, which encrypts data sent and received, prevents e-mails being intercepted during delivery. Many mail servers currently support TLS encryption. (*1)

Encryption of outgoing mail: approx. 96.3

Encryption of incoming e-mails: approx. 96.0% (*1) According to our own research conducted in January 2026

Recently, the danger of "PPAP (P: send Zip-encrypted file with password, P: send password, A: encryption, P: protocol)," which may result in eavesdropping of attached files and targeted e-mail attacks, has been pointed out. The "TLS Confirmation Function" allows the sender to simply attach a file and the receiver does not need to perform any special operation, thus ensuring security without placing a burden on both parties and providing a fundamental solution to the "PPAP problem.

Patent Information (Excerpt)

Title of invention : E-mail transmission system

Application number : JP-A2023-101191 (Application date : June 20, 2023)

Patent number : No. 7802377

Registration date : January 9, 2026

About "Active! gate SS

Active! gate SS" is a full-fledged cloud-based e-mail misdelivery prevention service with the No.1(*2) sales share for five consecutive years(*3) that works with Microsoft 365, Google Workspace, and LINE WORKS. With the concept of "selectable functions," "immediate use," and "low price despite high quality," this reliable service can be used immediately even on a small scale, starting at 300 yen per e-mail address per month (tax not included). Seven functions are offered in two plans to suit your style: "temporary suspension of outgoing mail," "Web download of attached files," "TLS confirmation function (PPAP measures)," "filtering," "encryption of attached files," "header conversion (forced Bcc conversion and automatic assignment of Cc/Bcc)," and "supervisor approval. The service is available in two plans to suit your style. The new "TLS" system combines security and convenience, preventing information leaks via e-mail and attachments. In particular, the newly released "TLS confirmation function" is a new feature that fundamentally solves the problems of PPAP.

(*2) From "Current Status and Future Outlook of the Insider Threat Prevention Solution Market FY2024" published by Deloitte Tohmatsu MIC Economic Research Institute https://mic-r.co.jp/mr/03370/

Reference link: https://activegate-ss.jp/

About "Active! gate

gate" is an e-mail misdelivery prevention product that prevents information leaks and inadvertent errors via e-mails and attached files. It is also effective against PPAP (Zip-encrypted transmission of attached files), which has been pointed out as an information leak risk in recent years. Seven approaches to prevent information leaks: "Temporary suspension of outgoing e-mails," "Web download of attached files," "TLS confirmation function (PPAP countermeasure)," "filtering," "encryption of attached files," "header conversion (forced Bcc conversion and automatic assignment of Cc/Bcc)," and "supervisor approval (optional). The seven approaches, "header conversion (forced conversion to Bcc, automatic assignment of Cc/Bcc)," and "supervisor approval (optional)," prevent serious errors such as "wrong recipients," "wrong attachments," and "simultaneous delivery with To or Cc when intended as Bcc. In particular, the newly released "TLS Confirmation Function" is a new function that fundamentally solves PPAP issues.

Reference link: https://on-pre.qualitia.com/product/ag/

About QualityA

QualityA is a messaging solutions company that develops and sells products in Japan. The company focuses on email and email security, and contributes to the efficiency of communication through its flagship webmail "Active! mail" and large-scale email system "DEEPMail". gate SS, a cloud-based e-mail error prevention service that works with Microsoft 365, Google Workspace, and LINE WORKS, and Active! vault SS, a cloud-based e-mail archiving service. In May 2023, we released "Active! zone SS," a cloud-based targeted email attack prevention service that works with Microsoft 365 and Google Workspace, and "Active! zone SS," a targeted email attack prevention solution that has been adopted by more than 400 local governments. zone, which has been adopted by more than 400 local governments, and has been highly acclaimed for blocking a number of targeted email attacks by Emotet.

Reference link: https://www.qualitia.com/jp/