Communication
Every listing carries the same fields in the same order. Counts beside each filter update as you narrow.
| API | Pricing | Auth | Format | Free tier | Status |
|---|---|---|---|---|---|
Atomic MailSelf-registers a real email inbox for an AI agent (PoW, no signup) and sends/receives mail via JMAP. Communication › Email | Free | API key | JSON | Unlimited | Live |
Best-TempMailCreates disposable email inboxes and reads incoming messages, including OTP extraction on paid plans. Communication › Disposable Email | Freemium | None | JSON | 1k–10k/day | Down |
BrevoSend transactional and marketing email, SMS and WhatsApp, and manage contacts via one REST API. Communication › Email | Freemium | API key | JSON | 100–1k/day | Live |
DropMail.meCreate disposable email inboxes via GraphQL, then read or subscribe to incoming mail in real time. Communication › Disposable Email | Free | API key | JSON | Unlimited | Live |
Email Spam TesterSends a test email through 42 deliverability and spam checks, then returns a scored JSON report. Communication › Email | Free | None | JSON | <100/day | Untested |
EmailJSSends transactional emails from client-side JavaScript without a backend server. Communication › Email | Freemium | API key | JSON | <100/day | Untested |
FreeCustom.EmailDisposable email inboxes with message fetching and automated OTP/verification-code extraction. Communication › Disposable Email | Freemium | API key | JSON | <100/day | Untested |
Guerrilla MailGenerates disposable email addresses and reads their inbox through a simple JSON API, no signup. Communication › Disposable Email | Free | None | JSON | Unlimited | Live |
httpSMSTurns your own Android phone into a controllable SMS gateway you call over HTTP. Communication › SMS | API key | JSON | — | Untested | |
ImprovMXManages email forwarding aliases and SMTP sending credentials for a custom domain. Communication › Email | Freemium | API key | JSON | 10k+/day | Live |
inboxsinkCreates disposable inboxes and blocks until a message arrives, extracting OTP codes for test automation. Communication › Disposable Email | Freemium | API key | JSON | <100/day | Live |
IndiePitcherSends transactional emails with markdown support and manages contact lists for SaaS apps Communication › Email | Freemium | API key | JSON | <100/day | Live |
mail.tmCreates disposable inboxes and lets apps poll or fetch mail sent to them, no signup needed. Communication › Disposable Email | Free | API key | JSON | Unlimited | Live |
MailjetTransactional and marketing email sending, contact list management, and delivery stats via REST API. Communication › Email | Freemium | API key | JSON | 100–1k/day | Live |
MailsacDisposable email inboxes for QA/testing: read, search and validate mail via API, webhooks or websocket. Communication › Disposable Email | Freemium | API key | JSON | <100/day | Live |
MailtrapTransactional and bulk email sending API with a built-in sandbox for safely testing emails. Communication › Email | Freemium | API key | JSON | 100–1k/day | Untested |
OneSignalSend push, email, SMS and in-app messages from one REST API, with segmentation and delivery data. Communication › Push | Freemium | API key | JSON | — | Untested |
PostStackEU-hosted transactional and marketing email sending with templates, broadcasts and webhooks. Communication › Email | Freemium | API key | JSON | 100–1k/day | Live |
Pusher BeamsSends push notifications to iOS, Android and web apps via device interests or authenticated users. Communication › Push | Freemium | API key | JSON | — | Untested |
Pusher ChannelsManaged realtime pub/sub messaging with presence channels for live dashboards, chat, and activity feeds. Communication › Chat | Freemium | Other | JSON | 10k+/day | Untested |
ResendSends transactional and marketing emails from your app via a REST API with domain verification. Communication › Email | Freemium | API key | JSON | 100–1k/day | Live |
SendGridTransactional and marketing email delivery API with templates, webhooks, and delivery analytics. Communication › Email | Free trial | API key | JSON | — | Untested |
SentSends SMS, WhatsApp and RCS messages through one API with automatic channel routing and fallback. Communication › SMS | Paid | API key | JSON | — | Untested |
SMTPfastSends transactional email and manages contacts, segments and broadcast campaigns via a REST API. Communication › Email | Freemium | API key | JSON | 100–1k/day | Live |
Xeramail Temp MailCreate disposable inboxes and read incoming mail via API, with auto-extracted OTP codes. Communication › Disposable Email | Paid | API key | JSON | — | Untested |
ZyntraDisposable inboxes for QA/dev testing; create mailboxes and fetch received emails or OTPs by API. Communication › Disposable Email | Freemium | API key | JSON | <100/day | Live |
Atomic MailFreeLive
Self-registers a real email inbox for an AI agent (PoW, no signup) and sends/receives mail via JMAP.
API key · JSON
Unlimited
llms.txt
Best-TempMailFreemiumDown
Creates disposable email inboxes and reads incoming messages, including OTP extraction on paid plans.
None · JSON
1k–10k/day
no machine-readable spec
BrevoFreemiumLive
Send transactional and marketing email, SMS and WhatsApp, and manage contacts via one REST API.
API key · JSON
100–1k/day
llms.txt
DropMail.meFreeLive
Create disposable email inboxes via GraphQL, then read or subscribe to incoming mail in real time.
API key · JSON
Unlimited
no machine-readable spec
Email Spam TesterFreeUntested
Sends a test email through 42 deliverability and spam checks, then returns a scored JSON report.
None · JSON
<100/day
llms.txt
EmailJSFreemiumUntested
Sends transactional emails from client-side JavaScript without a backend server.
API key · JSON
<100/day
no machine-readable spec
FreeCustom.EmailFreemiumUntested
Disposable email inboxes with message fetching and automated OTP/verification-code extraction.
API key · JSON
<100/day
llms.txt
Guerrilla MailFreeLive
Generates disposable email addresses and reads their inbox through a simple JSON API, no signup.
None · JSON
Unlimited
no machine-readable spec
httpSMSUntested
Turns your own Android phone into a controllable SMS gateway you call over HTTP.
API key · JSON
—
llms.txt
ImprovMXFreemiumLive
Manages email forwarding aliases and SMTP sending credentials for a custom domain.
API key · JSON
10k+/day
llms.txt
inboxsinkFreemiumLive
Creates disposable inboxes and blocks until a message arrives, extracting OTP codes for test automation.
API key · JSON
<100/day
no machine-readable spec
IndiePitcherFreemiumLive
Sends transactional emails with markdown support and manages contact lists for SaaS apps
API key · JSON
<100/day
OpenAPI spec · llms.txt
mail.tmFreeLive
Creates disposable inboxes and lets apps poll or fetch mail sent to them, no signup needed.
API key · JSON
Unlimited
llms.txt
MailjetFreemiumLive
Transactional and marketing email sending, contact list management, and delivery stats via REST API.
API key · JSON
100–1k/day
no machine-readable spec
MailsacFreemiumLive
Disposable email inboxes for QA/testing: read, search and validate mail via API, webhooks or websocket.
API key · JSON
<100/day
OpenAPI spec
MailtrapFreemiumUntested
Transactional and bulk email sending API with a built-in sandbox for safely testing emails.
API key · JSON
100–1k/day
MCP server · llms.txt
OneSignalFreemiumUntested
Send push, email, SMS and in-app messages from one REST API, with segmentation and delivery data.
API key · JSON
—
llms.txt
PostStackFreemiumLive
EU-hosted transactional and marketing email sending with templates, broadcasts and webhooks.
API key · JSON
100–1k/day
llms.txt
Pusher BeamsFreemiumUntested
Sends push notifications to iOS, Android and web apps via device interests or authenticated users.
API key · JSON
—
no machine-readable spec
Pusher ChannelsFreemiumUntested
Managed realtime pub/sub messaging with presence channels for live dashboards, chat, and activity feeds.
Other · JSON
10k+/day
no machine-readable spec
ResendFreemiumLive
Sends transactional and marketing emails from your app via a REST API with domain verification.
API key · JSON
100–1k/day
llms.txt
SendGridFree trialUntested
Transactional and marketing email delivery API with templates, webhooks, and delivery analytics.
API key · JSON
—
OpenAPI spec
SentPaidUntested
Sends SMS, WhatsApp and RCS messages through one API with automatic channel routing and fallback.
API key · JSON
—
no machine-readable spec
SMTPfastFreemiumLive
Sends transactional email and manages contacts, segments and broadcast campaigns via a REST API.
API key · JSON
100–1k/day
llms.txt
Xeramail Temp MailPaidUntested
Create disposable inboxes and read incoming mail via API, with auto-extracted OTP codes.
API key · JSON
—
no machine-readable spec
ZyntraFreemiumLive
Disposable inboxes for QA/dev testing; create mailboxes and fetch received emails or OTPs by API.
API key · JSON
<100/day
OpenAPI spec
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