All providers
69 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.
Deliverability
9 providersMail-Tester
Simple send-to-test-address spam score checks.
Postmark DMARC
Free weekly DMARC digests, plus a paid DMARC Digests upgrade.
dmarcian
DMARC management from one of the category specialists.
EasyDMARC
DMARC, SPF, DKIM, BIMI, and deliverability monitoring.
GlockApps
Inbox placement testing plus DMARC analytics.
MailReach
Email warmup plus spam testing for outbound teams.
TrulyInbox
Warmup priced by daily emails instead of connected accounts.
MXToolbox
Blacklist, DNS, DMARC, and delivery monitoring tools.
Warmy
Email warmup and deliverability monitoring for sender reputation.
Inbound
6 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.
ParseForce
Inbound email to schema-validated JSON.
EmailConnect
EU-hosted inbound email to webhook service.
MailSlurp
Programmable inboxes for testing, inbound workflows, and email automation.
Marketing
16 providersCustomer.io
Behavior-driven lifecycle messaging.
Loops
Modern lifecycle and broadcast email for SaaS.
Userlist
SaaS lifecycle email with account-level data.
Encharge
SaaS-focused marketing automation with behavior-based flows.
ActiveCampaign
Broad marketing automation and CRM for growing businesses.
Klaviyo
Ecommerce-focused marketing automation.
Drip
Ecommerce marketing automation with behavior-based segmentation.
Brevo
All-in-one with a generous daily free tier.
Sender
Budget-friendly email marketing with a generous free plan.
Mailchimp / Mandrill
Legacy marketing giant, transactional via Mandrill.
Elastic Email
Low-cost email API and SMTP relay with marketing features nearby.
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.
SendPulse
Marketing suite with a generous transactional SMTP tier.
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
6 providersKnock
Notification infrastructure with workflow engine.
Novu
Open-source notification infrastructure.
SuprSend
Notification workflow API with preferences, batching, and multi-tenant options.
Courier
Notification infrastructure with visual journeys.
Engagespot
Multi-channel notification infrastructure with predictable event pricing.
MagicBell
Notification inbox and multi-channel delivery platform.
Self-hosted
8 providersPostal
Open-source mail delivery platform.
mailcow
Dockerized groupware and email server suite.
maddy
Composable all-in-one mail server.
Plunk
Open-source unified email platform.
Listmonk
Self-hosted newsletter and mailing list manager.
Cuttlefish
Open-source transactional email server with a web UI.
Novu
Open-source notification infrastructure.
Ghost
Open-source publishing with built-in memberships and email.
Templates
7 providersReact Email
Build emails with React components.
Parcel
Code-first email editor with live previews across major clients.
Handlebars
Minimal logic template language used across email systems.
Maizzle
Tailwind-based email framework.
MJML
Markup language for responsive email.
Foundation for Emails
Responsive email framework with Inky markup and Sass tooling.
Liquid
Safe template language created by Shopify.
Testing
10 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).
Parcel
Code-first email editor with live previews across major clients.
Litmus
Email client previews and pre-send QA across 100+ inbox environments.
MailSlurp
Programmable inboxes for testing, inbound workflows, and email automation.
Email on Acid
Email previews and pre-deployment QA across 90+ clients.
Transactional
22 providersAmazon SES
Cheapest at scale, most setup work.
Postmark
Transactional-only, fast and well-delivered.
Mailgun
Developer-leaning email infra, owned by Sinch.
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.
Elastic Email
Low-cost email API and SMTP relay with marketing features nearby.
SendPulse
Marketing suite with a generous transactional SMTP tier.
SendLayer
Transactional email delivery with simple annual plans.
Resend
Email API tightly coupled to React Email.
SMTP.com
Legacy SMTP relay and email delivery service.
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.
Cuttlefish
Open-source transactional email server with a web UI.
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.