All providers
36 providers across transactional, marketing, newsletters, testing, self-hosted, notifications, inbound, and template engines. Within each category, ordered by editorial ranking; unranked entries follow by developer experience.
Inbound
3 providersCloudflare Email Service
Free routing, programmable inbound via Workers, sending in beta.
Inbound (inbound.new)
Email-to-webhook with TypeScript-first DX.
CloudMailin
Long-running inbound email to HTTP service.
Marketing
9 providersCustomer.io
Behavior-driven lifecycle messaging.
Loops
Modern lifecycle and broadcast email for SaaS.
Klaviyo
Ecommerce-focused marketing automation.
Brevo
All-in-one with a generous daily free tier.
Mailchimp / Mandrill
Legacy marketing giant, transactional via Mandrill.
Plunk
Open-source unified email platform.
Kit
Creator-focused newsletter platform (formerly ConvertKit).
Mailjet
European-focused, GDPR-friendly all-in-one.
SendGrid
Twilio-owned veteran with broad SDK coverage.
Newsletter
6 providersButtondown
Minimalist, indie-built newsletter platform.
Ghost
Open-source publishing with built-in memberships and email.
Loops
Modern lifecycle and broadcast email for SaaS.
Kit
Creator-focused newsletter platform (formerly ConvertKit).
Listmonk
Self-hosted newsletter and mailing list manager.
Substack
Hosted newsletter platform with social network features.
Notifications
3 providersKnock
Notification infrastructure with workflow engine.
Novu
Open-source notification infrastructure.
Courier
Notification infrastructure with visual journeys.
Self-hosted
5 providersPostal
Open-source mail delivery platform.
Plunk
Open-source unified email platform.
Listmonk
Self-hosted newsletter and mailing list manager.
Novu
Open-source notification infrastructure.
Ghost
Open-source publishing with built-in memberships and email.
Templates
3 providersReact Email
Build emails with React components.
Maizzle
Tailwind-based email framework.
MJML
Markup language for responsive email.
Testing
6 providersMailpit
Modern local SMTP catcher.
Mailtrap
Originally a staging inbox, now a sender too.
Ethereal Email
Throwaway SMTP accounts on demand.
MailDev
Node-based local SMTP catcher.
MailCatcher
Tiny Ruby-based local SMTP catcher.
MailHog
Classic local SMTP catcher (unmaintained since 2020).
Transactional
17 providersPostmark
Transactional-only, fast and well-delivered.
Mailgun
Developer-leaning email infra, owned by Sinch.
Amazon SES
Cheapest at scale, most setup work.
SMTP2GO
Reliable SMTP relay with strong deliverability.
Mailtrap
Originally a staging inbox, now a sender too.
Loops
Modern lifecycle and broadcast email for SaaS.
SendGrid
Twilio-owned veteran with broad SDK coverage.
MailerSend
Modern transactional API with a clean UI.
Resend
Email API tightly coupled to React Email.
Cloudflare Email Service
Free routing, programmable inbound via Workers, sending in beta.
Brevo
All-in-one with a generous daily free tier.
Customer.io
Behavior-driven lifecycle messaging.
Plunk
Open-source unified email platform.
Mailjet
European-focused, GDPR-friendly all-in-one.
Postal
Open-source mail delivery platform.
SparkPost
High-volume sender with deep analytics.
Mailchimp / Mandrill
Legacy marketing giant, transactional via Mandrill.