blastengine is a transactional email delivery service from RAKUS Light Cloud, a subsidiary of Tokyo Stock Exchange Prime Market listed RAKUS. The service helps developers send automated emails like order confirmations and password resets without managing email infrastructure. It achieves high delivery rates to Japanese carriers like docomo, au, and SoftBank by handling their unique policies.

The service provides an API for sending emails from your code. Software Development Kits for multiple programming languages are available on GitHub to speed up development.

You can migrate from existing email systems by simply changing server settings. No code rewriting needed.

Both delivery methods are included at no extra charge, so you can choose the API for full control or SMTP relay for easier migration.

The platform handles high-volume email delivery through data centers in Japan with high uptime. RAKUS Light Cloud actively monitors and maintains shared IP reputation, handling blacklist removal and quality assurance. The service supports email authentication standards (SPF, DKIM, and DMARC) with setup assistance, fully complying with Gmail sender guidelines. Real-time notifications alert your system when delivery events like failures and bounces occur.

A free trial plan is available for testing without credit card signup. Customer support, documentation, and the management interface are provided entirely in Japanese.