SendGrid

SendGrid (now part of Twilio) handles everything from transactional emails (password resets, order confirmations) to marketing campaigns and newsletters. The platform handles server management, spam filter optimization, and deliverability challenges so companies can focus on their core work while emails reach the right inboxes. Users can integrate SendGrid via its API or SMTP relay service into their applications to automate email sending. The platform is popular among early-stage and growth-stage companies due to its developer-friendly API, strong deliverability tooling, and ability to scale from a few thousand to millions of emails per month without re-architecting. SendGrid delivers more than 200 billion emails every month.