Case Study: ChatWork achieves real-time, scalable email delivery with Twilio SendGrid

ChatWork delivers in Japan with Twilio SendGrid and KKE

ChatWork, Japan’s leading business chat application, needed a more reliable and scalable way to send real-time email notifications for unread messages as usage grew. Its existing email setup was costly to scale and sometimes caused delayed or undelivered messages, putting user engagement at risk. ChatWork turned to Twilio SendGrid, with support from KKE, to improve its email infrastructure.

Twilio implemented Twilio SendGrid’s SMTP API, helping ChatWork move its email program in just 3 months and prepare to send millions of emails per month. The results included 100x faster delivery times than its previous solution and a 100% reduction in time spent managing email, freeing the team to focus on product innovation and real-time communication.

ChatWork

Masaki Yamamoto

Chief Technology Officer