SendGrid is a cloud-based email delivery service for transactional and marketing emails. It provides APIs and SMTP relay for high-volume email sending with features such as email templates, delivery tracking, analytics, A/B testing, and suppression list management. SendGrid ensures deliverability with dedicated IPs, domain authentication (SPF/DKIM), and real-time event webhooks. It’s widely used for user registration emails, password resets, order confirmations, and drip campaigns. SendGrid is designed for developers needing scalable, reliable email infrastructure and is integrated into platforms like Twilio, Microsoft Azure, and Heroku.

SendGrid is blocked in mainland China. Its dashboard and API endpoints (such as api.sendgrid.com) are not reliably reachable. Emails sent via SendGrid’s infrastructure may reach Chinese recipients, but image hosting, tracking links, and click events are often filtered or dropped. This reduces the effectiveness of marketing campaigns and limits the usefulness of engagement analytics. Furthermore, SendGrid’s infrastructure may be blacklisted by local ISPs or subject to additional spam filtering. Developers targeting Chinese users typically use local services such as SendCloud or Aliyun DirectMail, which provide better deliverability and compliance with local anti-spam regulations. These services also offer SMS fallback and Chinese-language interfaces. For global SaaS platforms with users in China, dual integration with SendGrid and a China-localized provider is recommended to maintain reliability.

The information regarding service availability in China is provided for general reference purposes only. Due to the dynamic nature of network conditions and regulatory environments, the actual accessibility of these services may vary over time and by location. Users are advised to verify the current status independently.