Curumeru is an email delivery system from RAKUS, a Tokyo Stock Exchange Prime Market listed company. Since launching in 2011, the service has supported many companies and accounts. It helps teams add email delivery functionality to existing systems including member management, recruitment platforms, e-commerce, and marketing automation tools.

The platform provides an API for sending emails from your code with comprehensive tracking features. Teams can see who opened HTML emails, which links were clicked, and detailed error information across nine categories. The API enables scheduled delivery with personalized content, and all tracking data exports to CSV format for analysis.

Migration from existing systems requires minimal changes. Just point your mail server to Curumeru. Daily reports include yesterday’s delivery counts, failed addresses with error causes, and automatically stopped addresses. You can strengthen email delivery while keeping your existing email creation screens and workflows.

The service handles high-volume email by distributing sends across multiple IP addresses and adjusting volume per carrier to avoid blocking. Automatic stops to addresses with too many errors prevent issues. Teams can set prohibited delivery times with automatic pause and resume. An HTML editor with multiple templates lets non-technical users create professional emails.

Infrastructure uses domestic data centers with 24/7 monitoring and earthquake-resistant structure. Support provides fast response times with phone and email available on weekdays.