Email Marketing

Twilio's widely used email API and SMTP relay for transactional and marketing mail

AWS's pay-as-you-go email sending and receiving infrastructure

Developer-first email API for sending, receiving, and validating email at scale

Marketing automation with AI-driven send timing

Fast, deliverability-obsessed transactional email API built for developers

Developer-friendly email API built around React Email templates

Mailchimp's transactional email add-on API

All-in-one marketing platform, formerly Sendinblue

Newsletter platform built by former Morning Brew engineers

AI-powered customer platform with HubSpot Breeze agents

Email API and SMTP relay with a real-time collaborative template editor

The leading email and SMS platform for ecommerce, now AI-powered

Email sandbox for testing, paired with a production transactional sending API

Email marketing platform with AI send-time and copy tools

High-volume transactional email API with real-time deliverability analytics