The company Twilio has a close relationship with SendGrid, another provider of APIs and cloud-based email infrastructure. SendGrid offers an easy-to-use API that provides reliable and scalable email delivery, as well as real-time analytics to help optimize email campaigns. By using SendGrid, businesses can save time and resources by not having to build and maintain their own email systems in-house. Additionally, SendGrid's expertise in deliverability ensures that emails reach their intended destination, a problem that affects 20% of legitimate emails on average. With its scalable infrastructure and easy integration with APIs, SendGrid is a popular choice for businesses looking to improve their email communication.