SendGrid

SendGrid is a cloud-based email delivery service that provides a programmable infrastructure for sending transactional and marketing emails. Through an API and SMTP relay, developers can send emails at scale, while marketing teams can manage campaigns and templates. The platform includes deliverability analytics, reputation monitoring, and tools to optimize inbox placement.

Founded in 2009, SendGrid grew into a popular choice for developers and marketers seeking reliable email delivery. The company completed its initial public offering on the New York Stock Exchange in 2017 under the ticker SEND. In 2019, Twilio announced plans to acquire SendGrid for approximately $3 billion in cash and stock; the acquisition was completed later that year, and SendGrid operates as part of Twilio's communications platform.

Key products include Email API, SMTP Relay, Marketing Campaigns, Dynamic Templates, and Event Webhooks, with features for real-time analytics, deliverability insights, and IP reputation management. The service emphasizes scalable sending, automation, and performance at high volumes.

Security and compliance programs include TLS encryption for data in transit, DKIM, SPF, and DMARC for authentication, as well as SOC 2 Type II compliance and GDPR privacy protections. SendGrid serves a wide range of customers, from startups to large enterprises, across industries such as software, e-commerce, and publishing, with data centers and sending domains distributed globally to support regional deliverability.

As part of Twilio, SendGrid integrates with other communication services to support customer lifecycle communications across channels.