Scaling by Design: 3T Emails and Growing` at Twilio SendGrid highlights the company's achievement of surpassing 3 trillion processed emails in May 2020. This milestone is a testament to their design and planning for scale, which has enabled them to maintain high availability (4 9s uptime) and low median delivery time of 1.9 seconds. The team's focus on building reliable, scalable infrastructure has allowed them to support senders of all sizes, including small businesses, without compromising performance. Fair queuing and direct network peering relationships with customers and inboxes have also been key factors in their success. As they continue to grow, Twilio SendGrid is executing strategies to reduce customer latency, provide greater insight into customer sends, and scale to meet the challenges of massive growth.