Cuenote SR-S is a high-speed mail relay service and email sending API from Ymir Link, a Tokyo Stock Exchange Standard Market listed company. The service helps engineers strengthen email delivery infrastructure without replacing existing systems. It achieves high-volume delivery performance through a custom-built mail engine.

The platform acts as a relay server for companies with existing email systems, solving delivery delays and low success rates. Integration requires no coding. You keep your current systems while strengthening only the email delivery layer.

Email sending via API is available as an optional feature in dedicated environment plans. API sample code is provided with technical support from dedicated staff. Teams can retrieve delivery logs through the API.

The service handles large-scale delivery across the entire Cuenote series with many system contracts and high customer retention. The custom mail engine controls communication for each domain and is regularly tuned for the characteristics of Japanese ISPs and carriers. Detailed error analysis automatically excludes addresses when error counts exceed thresholds. Optional disaster recovery enables backup configuration at multiple locations for business continuity with high uptime.

The service offers flexible deployment models including shared environment for low-cost operations, dedicated environment for fast and reliable delivery, and on-premises license provision for companies wishing to operate on their own servers.