Mailgun
Powerful Transactional Email APIs that enable you to send, receive, and track emails, built with developers in mind
Bird Email API (formerly SparkPost)
Email Sending API Service - Cloud-based email delivery platform enabling developers and businesses to send, track, and optimize emails at scale
Mailjet
Email Marketing Software & Email API - Design, deliver, and automate marketing & transactional emails with built-in deliverability, GDPR compliance, and developer-ready email APIs
Twilio SendGrid
Turn emails into revenue with a fully integrated email platform delivering 148+ billion emails monthly
Brevo
All-in-one marketing platform for email, SMS, and customer engagement at scale (formerly Sendinblue)