Every developer email tool, in one place.

MailKite

Ours

Receive email as a webhook, send with one API. Unlimited free domains.

Resend

Polished send API with a React-first SDK; inbound added more recently.

Postmark

Battle-tested transactional send + inbound parse, known for deliverability.

MailKite MCP

Ours

Hosted OAuth MCP — agents get their own inbox, no local install.

CloudMailin

Pioneered inbound-email-to-HTTP; inbound-focused, no first-class send.

Mailtrap

Catch test emails in a safe sandbox; separate sending for production.

MailKite

Ours

Receive email as a webhook, send with one API. Unlimited free domains.

Resend

Polished send API with a React-first SDK; inbound added more recently.

Postmark

Battle-tested transactional send + inbound parse, known for deliverability.

Deliverability heavyweight for outbound at scale; inbound parse is secondary.

Lowest per-email price; inbound needs receipt rules + S3 + SNS + Lambda.

Mailgun

Flexible inbound Routes via a regex rule engine; sending-first platform.

MailerSend

Transactional + SMS API; inbound routing; sibling to MailerLite.

Brevo

Multi-channel suite (email/SMS/WhatsApp) + transactional API; formerly Sendinblue.

Send API + MJML templating + collaboration; inbound Parse API. Owned by Sinch.

SparkPost (Bird)

Enterprise delivery + analytics; brand dissolved into Bird.

Elastic Email

Low-cost email API + marketing; reseller/white-label; MCP server.

SocketLabs

Delivery + Spotlight analytics/routing across multiple providers.

ZeptoMail

Transactional-only; Zoho-backed; credit-based pricing.

Loops

Contact-based pricing; transactional + broadcast in one; for SaaS.

Plunk

Open-source (AGPL); transactional + marketing + automation; self-host.

MailPace

Transactional-only; EU-hosted; no tracking; idempotency keys.

Mandrill (Mailchimp)

Mailchimp's transactional add-on; API + SMTP + inbound parsing.

Self-hosted; one-time license; sends via SES for ~$1/10k.

Listmonk

OSS (AGPL); single Go binary; extreme throughput; multi-SMTP queues.

Mautic

OSS (GPL); marketing automation + CRM; the self-hosted HubSpot.

Marketing email + landing pages + MCP server; EU-resident.

Kit (ConvertKit)

Creator-focused; paid newsletters + commerce; Kit MCP.

Lifecycle/behavioral; email/SMS/push/in-app; Liquid templating; dev SDKs.

Ecommerce CRM + email/SMS; Shopify-centric; built-in CDP.

Marketing automation + CRM; best automation builder; owns Postmark.

MailKite

Ours

Receive email as a webhook, send with one API. Unlimited free domains.

CloudMailin

Pioneered inbound-email-to-HTTP; inbound-focused, no first-class send.

Mailparser

No-code visual parsing rules; great for non-devs extracting data from email.

Parseur

AI parsing (no template training); OCR 200+ languages; EU-hosted.

Docparser

Document-focused parsing; zonal OCR; email-attachment ingest.

MailKite

Ours

Receive email as a webhook, send with one API. Unlimited free domains.

MailKite MCP

Ours

Hosted OAuth MCP — agents get their own inbox, no local install.

AgentMail

Funded incumbent in agent-email; inboxes agents can own.

Nylas

Wraps existing mailboxes (Gmail/Outlook) under one API — not its own mail.

Gmail API

Reads/sends from existing Gmail accounts; requires OAuth scope per user.

Reads/sends from Outlook/M365 mailboxes; enterprise OAuth scopes.

MailKite

Ours

Receive email as a webhook, send with one API. Unlimited free domains.

Dependable send-only SMTP relay; SMTP-first UX.

MailChannels

Anti-abuse SMTP for hosts/platforms; per-sender reputation isolation.

Long-running premium SMTP relay; dedicated IPs; enterprise-leaning.

MailKite

Ours

Receive email as a webhook, send with one API. Unlimited free domains.

MXToolbox

The go-to free lookup tools for DNS, MX, and blacklist checks.

dmarcian

Purpose-built DMARC analytics and enforcement guidance.

Free /10 spam score; SPF/DKIM/DMARC checks; one-email test.

GlockApps

Seed-list inbox placement; blocklist monitoring; DMARC analytics.

MailReach

Auto email warmup; spam checker; cold-outreach focus.

99.6% accuracy verification; warmup; inbox placement; DMARC; all-in-one.

NeverBounce

Bulk + real-time verification; integrates with major ESPs/CRMs.

Domain-based email pattern discovery; verification; cold campaigns.

Google Postmaster Tools

Free Gmail reputation + spam-rate + auth data; required since 2024 sender rules.

MailKite

Ours

Receive email as a webhook, send with one API. Unlimited free domains.

Mailtrap

Catch test emails in a safe sandbox; separate sending for production.

Mailosaur

Capture-and-assert inboxes for E2E test automation.

testmail.app

Disposable inboxes + JSON API for E2E email tests.

Ethereal Email

Free fake SMTP; auto-generated test creds; Nodemailer-native.

MailCatcher

Ruby gem; SMTP on :1025, web UI on :1080; the original catcher.

Mailpit

Fast Go catcher; the modern MailHog successor; widely adopted.

Inbucket

Go SMTP server that swallows mail; web UI + REST API; tagged mailboxes.

MailKite

Ours

Receive email as a webhook, send with one API. Unlimited free domains.

Roundcube

The classic self-hosted webmail UI; IMAP-based, mature.

SnappyMail

Fast RainLoop fork; PGP/MIME; default in Mailcow.

Cypht

Aggregates accounts into one feed; modular; no DB required.

Hey

Opinionated premium email ($99/yr); Screener + Bundles; spyon stripping.

Superhuman

Premium client ($30/seat/mo); keyboard-first; AI triage; Gmail/Outlook.

MailKite

Ours

Receive email as a webhook, send with one API. Unlimited free domains.

Mailcow

Batteries-included self-hosted mail server; runs in Docker.

Stalwart Mail Server

Single-binary Rust mail server with JMAP support; modern and fast.

Postal

Self-hosted send server with webhooks; you run and operate it.

Haraka

Pluggable Node.js SMTP daemon; the building block for custom mail pipelines.

Maddy

Single Go binary; SMTP + IMAP; modular; TLS automation.

Mailu

Docker-first; full stack (Postfix/Dovecot/Rspamd/ClamAV); admin UI.

Docker-Mailserver

Batteries-included Docker mail; Postfix/Dovecot/Rspamd; setup.sh CLI.

Poste.io

Free + paid Docker mail; management UI; SOGo groupware; mail archive.

iredmail

Bash installer; Postfix/Dovecot/SOGo; Amavisd/SpamAssassin; since 2007.

MailKite

Ours

Receive email as a webhook, send with one API. Unlimited free domains.

n8n

Node-based automation; wire email in/out of any workflow.

Code-friendly automation; trigger on email, call any API.

Zapier

No-code rules across thousands of apps; email in/out triggers.

Make

Visual scenario builder; routers + iterators; 1,800+ apps; AI agents.