SendGrid Email Delivery API

SendGrid is a cloud-based email delivery and marketing platform that provides reliable transactional and marketing email infrastructure for developers and businesses. Founded in 2009 by Isaac Saldana, Jose Lopez, and Tim Jenkins (CEO) in Denver, Colorado. The company went public on the NYSE in November 2017 (ticker: SEND) and was acquired by Twilio in February 2019 for $3 billion. SendGrid delivers over 90 billion emails per month for over 80,000 customers including Airbnb, Spotify, Uber, and Yelp. Key features: Email API: send transactional emails via REST API or SMTP relay. SDKs for 7 languages (Go, Java, Node.js, PHP, Python, Ruby, C#). Webhook event notifications for delivered, bounced, opened, clicked, and spam-reported emails. Templates: create dynamic email templates with Handlebars syntax for personalization. Version management and A/B testing. Dynamic data substitution. Marketing campaigns: create and send marketing email campaigns with a drag-and-drop email builder, contact management, segmentation, and automation. Suppression management: manage unsubscribes, bounces, spam reports, and invalid emails. Automatic suppression list maintenance. Deliverability: dedicated IP addresses for high-volume senders. Domain authentication (SPF, DKIM, DMARC) to improve inbox placement. ISP outreach and deliverability consulting. Subuser management: create sub-accounts with separate API keys, templates, and sending reputations. Ideal for agencies and platforms sending on behalf of clients. Stats and analytics: real-time email metrics including delivery rate, open rate, click rate, bounce rate, and unsubscribe rate. Geographic and device breakdowns. Parse webhook: parse incoming emails and extract content for processing. SendGrid Grid: enterprise-grade infrastructure with multi-region deployment and 99.99 percent uptime SLA. Integrations: Zapier, Segment, Salesforce, HubSpot. Go/Java. Proprietary.