# SendSend

> SendSend is an email API and dashboard. It sends transactional email (receipts, password resets, notifications) and marketing email (newsletters and announcements to people who opted in), receives inbound email, and shows a timeline of what happened to every message. Authenticate with a project API key as a bearer token at https://api.sendsend.email. A 202 on send means the message was queued, not delivered.

Key facts, quoted from our own pages:

- Free: $0. 3,000 emails a month, 100 emails a day, no extra emails (sending stops at the limit). Up to 3 domains, 1 live project and 2 team members.
- Pro: $20 a month. 50,000 emails a month, no daily limit, extra emails at $0.90 per 1,000, with a spending cap you set. Up to 10 domains, 5 live projects and 5 team members.
- Scale: $90 a month. 100,000 emails a month, no daily limit, extra emails at $0.90 per 1,000, with a spending cap you set. Up to 1,000 domains, 100 live projects and 25 team members.
- Enterprise: priced by quote (contact us). Custom volume, rate limits, domain and project limits, and written support terms.
- Not available: There is no SMTP relay yet: mail is sent through the API (or the WordPress plugin and integrations).
- Not available: There are no dedicated IP addresses.
- Not available: There is no single sign-on, and no SOC 2, ISO 27001 or HIPAA attestation.
- Not available: There is no uptime SLA unless one is agreed in an Enterprise contract.
- Not available: New accounts are reviewed before live sending is enabled. Test mode works immediately.

The full API is described in OpenAPI 3.1: https://sendsend.email/openapi.json
All of this, the guides and the API reference as one text file: https://sendsend.email/llms-full.txt

## About

- [About SendSend](https://sendsend.email/about): what it does, what it costs, and what it does not do yet.
- [Pricing](https://sendsend.email/pricing): Free, Pro, Scale and Enterprise.
- [Security](https://sendsend.email/security): what we do today, where data lives, and what we have not done.
- [Developers](https://sendsend.email/developers), [Agencies](https://sendsend.email/agencies), [Enterprise](https://sendsend.email/enterprise)

## Free tools and guides

- [Free email domain checker](https://sendsend.email/tools/domain-check): checks a domain's SPF, DKIM and DMARC and says what to fix.
- [Email templates](https://sendsend.email/templates): 60 free transactional templates in six categories (onboarding, security, e-commerce, WooCommerce, billing, notifications), each with its own page.
- [What is SPF, and how do you set it up?](https://sendsend.email/learn/what-is-spf): SPF lists the servers allowed to send email for your domain. Learn how an SPF record works, the mistakes that break it, and how to set one up and check it.
- [What is DKIM, and how do you set it up?](https://sendsend.email/learn/what-is-dkim): DKIM adds a digital signature to your email so receivers can tell it was not altered. Learn how DKIM works, what a selector is, and how to add and check it.
- [What is DMARC, and how do you roll it out safely?](https://sendsend.email/learn/what-is-dmarc): DMARC tells receivers what to do with mail that fails SPF and DKIM, and sends you reports. Learn the policies, how to start with p=none, and how to move to reject.
- [Why your emails go to spam, and how to fix it](https://sendsend.email/learn/why-emails-go-to-spam): The common reasons email lands in spam: missing authentication, a new sender, a poor list, complaints and content. A practical checklist to find yours and fix it.
- [Gmail and Yahoo’s email sender requirements, explained](https://sendsend.email/learn/gmail-yahoo-sender-requirements): What Gmail and Yahoo require from anyone who sends email: SPF, DKIM, DMARC, one-click unsubscribe and low spam rates. What counts as a bulk sender and how to comply.
- [How to warm up a new email sending domain](https://sendsend.email/learn/warm-up-a-new-sending-domain): A new domain has no sending reputation. Learn how to warm it up: start small, send to people who want your mail, increase gradually and watch bounces and complaints.
- [Transactional email vs marketing email](https://sendsend.email/learn/transactional-vs-marketing-email): Transactional email is triggered by something a person did; marketing email is sent to a list. Learn how they differ in purpose, rules, unsubscribe and how to send each.
- [WordPress contact form emails going to spam: why, and how to fix it](https://sendsend.email/learn/wordpress-contact-form-emails-going-to-spam): Why WordPress form and WooCommerce emails land in spam or never arrive, and how to fix it: authenticate your domain, send through a real email service, and set the From address correctly.
- [An email deliverability checklist for small businesses](https://sendsend.email/learn/email-deliverability-checklist): A practical checklist to get your email delivered: authenticate your domain, warm up, keep your list clean, make unsubscribing easy, watch your complaint rate and test.
- [How to set up an SPF record for Google Workspace](https://sendsend.email/learn/spf-record-for-google-workspace): The exact SPF record for Google Workspace, how to add other senders to it without breaking it, and how to check that it works.
- [SPF error: too many DNS lookups (the 10 lookup limit)](https://sendsend.email/learn/spf-too-many-dns-lookups): Why SPF fails with "too many DNS lookups", how to count them, and how to get back under the limit of ten.
- [WooCommerce emails not sending or going to spam: how to fix it](https://sendsend.email/learn/woocommerce-emails-not-sending): Order confirmations and password resets not arriving? A step-by-step way to find the cause and fix WooCommerce email delivery.

## Get started

- [Introduction](https://sendsend.email/docs): What SendSend is, how it works, and where to start.
- [Quickstart](https://sendsend.email/docs/quickstart): Send your first email in about five minutes.
- [Authentication](https://sendsend.email/docs/authentication): API keys, scopes, and test versus live.

## Guides

- [Signup forms](https://sendsend.email/docs/guides/signup-forms): Collect subscribers from your website with a confirmation email.
- [Blocklist monitoring](https://sendsend.email/docs/guides/blocklists): Get told when your domain or IP lands on a spam blocklist.
- [DMARC monitoring](https://sendsend.email/docs/guides/dmarc): See who sends as your domain, and when it is safe to tighten your policy.
- [Verify email addresses](https://sendsend.email/docs/guides/verify): Check an address before you send, one at a time or a list.
- [MCP server](https://sendsend.email/docs/guides/mcp): Connect Claude, Cursor or VS Code to SendSend with a URL and an API key.
- [Using SendSend with AI assistants](https://sendsend.email/docs/guides/ai-assistants): llms.txt, the OpenAPI file, safe keys for agents, and an MCP server.
- [Official libraries](https://sendsend.email/docs/guides/sdks): Python, PHP, Ruby, Go, .NET, Java and Rust libraries that cover the whole API.
- [Send an email](https://sendsend.email/docs/guides/send-email): Send with HTML, text, cc, bcc, reply-to and tags.
- [Open and click tracking](https://sendsend.email/docs/guides/tracking): See who opens and clicks, per domain, and what to know before turning it on.
- [Test mode and test addresses](https://sendsend.email/docs/guides/testing): Try every outcome without sending real email.
- [Templates](https://sendsend.email/docs/guides/templates): Design with blocks or the library, add conditions and lists, translate, and split test.
- [React Email](https://sendsend.email/docs/guides/react-email): Build emails as React components, preview them, and send them.
- [Audiences and broadcasts](https://sendsend.email/docs/guides/broadcasts): Keep a contact list and email all of it, with unsubscribe handled.
- [Receive email](https://sendsend.email/docs/guides/receive-email): Get a receiving address and read incoming mail by API or webhook.
- [Suppressions](https://sendsend.email/docs/guides/suppressions): Why we stop mailing an address, and how to manage the list.
- [Add and verify a domain](https://sendsend.email/docs/guides/domains): The DNS records, how to add them, and why verification takes time.
- [Webhooks](https://sendsend.email/docs/guides/webhooks): Receive delivery, bounce and complaint events, and verify signatures.
- [Deliverability](https://sendsend.email/docs/guides/deliverability): Why mail lands in spam and what to do about it.
- [WordPress plugin](https://sendsend.email/docs/guides/wordpress): Send all WordPress email through SendSend.

## Integrations

- [Next.js](https://sendsend.email/docs/integrations/nextjs): Send email from Next.js (TypeScript).
- [Express](https://sendsend.email/docs/integrations/express): Send email from Express (JavaScript).
- [Remix](https://sendsend.email/docs/integrations/remix): Send email from Remix (TypeScript).
- [Nuxt](https://sendsend.email/docs/integrations/nuxt): Send email from Nuxt (TypeScript).
- [SvelteKit](https://sendsend.email/docs/integrations/sveltekit): Send email from SvelteKit (TypeScript).
- [Astro](https://sendsend.email/docs/integrations/astro): Send email from Astro (TypeScript).
- [Hono](https://sendsend.email/docs/integrations/hono): Send email from Hono (TypeScript).
- [Cloudflare Workers](https://sendsend.email/docs/integrations/cloudflare-workers): Send email from Cloudflare Workers (TypeScript).
- [AWS Lambda](https://sendsend.email/docs/integrations/aws-lambda): Send email from AWS Lambda (JavaScript).
- [Supabase Edge Functions](https://sendsend.email/docs/integrations/supabase-edge-functions): Send email from Supabase Edge Functions (TypeScript).
- [Laravel](https://sendsend.email/docs/integrations/laravel): Send email from Laravel (PHP).
- [Django](https://sendsend.email/docs/integrations/django): Send email from Django (Python).
- [Flask](https://sendsend.email/docs/integrations/flask): Send email from Flask (Python).
- [FastAPI](https://sendsend.email/docs/integrations/fastapi): Send email from FastAPI (Python).
- [Ruby on Rails](https://sendsend.email/docs/integrations/rails): Send email from Ruby on Rails (Ruby).
- [Go](https://sendsend.email/docs/integrations/go): Send email from Go (Go).

## Platforms

- [Zapier](https://sendsend.email/docs/platforms/zapier): Send email and react to events from a Zap.
- [Make](https://sendsend.email/docs/platforms/make): Send email and receive events in a Make scenario.
- [n8n](https://sendsend.email/docs/platforms/n8n): Send email and start workflows with the SendSend node.
- [Supabase Auth](https://sendsend.email/docs/platforms/supabase): Send Supabase sign-in, sign-up and reset emails through SendSend.
- [Clerk](https://sendsend.email/docs/platforms/clerk): Send Clerk verification and sign-in emails through SendSend.

## Concepts

- [Idempotency](https://sendsend.email/docs/concepts/idempotency): Retry a send safely without delivering twice.
- [Message states](https://sendsend.email/docs/concepts/message-states): What queued, accepted, delivered and ambiguous mean.
- [Errors](https://sendsend.email/docs/concepts/errors): The error format and every error code.
- [Limits and quotas](https://sendsend.email/docs/concepts/limits): Request, recipient, daily and monthly limits.

## API reference

- [Overview](https://sendsend.email/docs/api): Base URL, conventions and the OpenAPI file.
- [Send an email](https://sendsend.email/docs/api/send-email): POST /v1/emails
- [Retrieve an email](https://sendsend.email/docs/api/get-email): GET /v1/emails/{id}
- [List emails](https://sendsend.email/docs/api/list-emails): GET /v1/emails
- [Reschedule an email](https://sendsend.email/docs/api/update-email): PATCH /v1/emails/{id}
- [Cancel a scheduled email](https://sendsend.email/docs/api/cancel-email): POST /v1/emails/{id}/cancel
- [Send a batch of emails](https://sendsend.email/docs/api/send-batch-emails): POST /v1/emails/batch
- [Add a domain](https://sendsend.email/docs/api/create-domain): POST /v1/domains
- [List domains](https://sendsend.email/docs/api/list-domains): GET /v1/domains
- [Retrieve a domain](https://sendsend.email/docs/api/get-domain): GET /v1/domains/{id}
- [Check a domain now](https://sendsend.email/docs/api/verify-domain): POST /v1/domains/{id}/verify
- [Get domain insights](https://sendsend.email/docs/api/get-domain-insights): GET /v1/domains/{id}/insights
- [Remove a domain](https://sendsend.email/docs/api/delete-domain): DELETE /v1/domains/{id}
- [Update a domain](https://sendsend.email/docs/api/update-domain): PATCH /v1/domains/{id}
- [Create or publish a template](https://sendsend.email/docs/api/create-template): POST /v1/templates
- [Update a template’s details](https://sendsend.email/docs/api/update-template): PATCH /v1/templates/{id}
- [Retrieve a template version](https://sendsend.email/docs/api/get-template-version): GET /v1/templates/{id}/versions/{version}
- [Restore an earlier version](https://sendsend.email/docs/api/restore-template-version): POST /v1/templates/{id}/restore
- [Send a test email from a template](https://sendsend.email/docs/api/test-template): POST /v1/templates/{id}/test
- [See how each version did](https://sendsend.email/docs/api/get-template-stats): GET /v1/templates/{id}/stats
- [List ready-made templates](https://sendsend.email/docs/api/list-library-templates): GET /v1/template-library
- [Retrieve a library template](https://sendsend.email/docs/api/get-library-template): GET /v1/template-library/{id}
- [Create a template from the library](https://sendsend.email/docs/api/create-template-from-library): POST /v1/templates/from-library
- [Save a block for reuse](https://sendsend.email/docs/api/create-saved-block): POST /v1/saved-blocks
- [List saved blocks](https://sendsend.email/docs/api/list-saved-blocks): GET /v1/saved-blocks
- [Delete a saved block](https://sendsend.email/docs/api/delete-saved-block): DELETE /v1/saved-blocks/{id}
- [Retrieve the brand kit](https://sendsend.email/docs/api/get-brand-kit): GET /v1/brand
- [Update the brand kit](https://sendsend.email/docs/api/update-brand-kit): PUT /v1/brand
- [List templates](https://sendsend.email/docs/api/list-templates): GET /v1/templates
- [Retrieve a template](https://sendsend.email/docs/api/get-template): GET /v1/templates/{id}
- [Preview a template](https://sendsend.email/docs/api/preview-template): POST /v1/templates/{id}/preview
- [Duplicate a template](https://sendsend.email/docs/api/duplicate-template): POST /v1/templates/{id}/duplicate
- [Delete a template](https://sendsend.email/docs/api/delete-template): DELETE /v1/templates/{id}
- [Create a webhook endpoint](https://sendsend.email/docs/api/create-webhook): POST /v1/webhooks
- [List webhook endpoints](https://sendsend.email/docs/api/list-webhooks): GET /v1/webhooks
- [Delete a webhook endpoint](https://sendsend.email/docs/api/delete-webhook): DELETE /v1/webhooks/{id}
- [Rotate the signing secret](https://sendsend.email/docs/api/rotate-webhook-secret): POST /v1/webhooks/{id}/rotate-secret
- [List deliveries](https://sendsend.email/docs/api/list-webhook-deliveries): GET /v1/webhooks/{id}/deliveries
- [Retrieve a delivery](https://sendsend.email/docs/api/get-webhook-delivery): GET /v1/webhooks/{id}/deliveries/{did}
- [Replay a delivery](https://sendsend.email/docs/api/replay-webhook-delivery): POST /v1/webhooks/{id}/deliveries/{did}/replay
- [Retrieve a webhook endpoint](https://sendsend.email/docs/api/get-webhook): GET /v1/webhooks/{id}
- [Update a webhook endpoint](https://sendsend.email/docs/api/update-webhook): PATCH /v1/webhooks/{id}
- [Add a suppression](https://sendsend.email/docs/api/add-suppression): POST /v1/suppressions
- [Add suppressions in bulk](https://sendsend.email/docs/api/add-batch-suppressions): POST /v1/suppressions/batch
- [List suppressions](https://sendsend.email/docs/api/list-suppressions): GET /v1/suppressions
- [Retrieve a suppression](https://sendsend.email/docs/api/get-suppression): GET /v1/suppressions/{id}
- [Remove a suppression](https://sendsend.email/docs/api/remove-suppression): DELETE /v1/suppressions/{id}
- [Remove suppressions in bulk](https://sendsend.email/docs/api/remove-batch-suppressions): POST /v1/suppressions/remove-batch
- [Verify an email address](https://sendsend.email/docs/api/verify-email): POST /v1/verify
- [Verify up to 100 email addresses](https://sendsend.email/docs/api/verify-emails): POST /v1/verify/batch
- [Monitor a domain’s DMARC](https://sendsend.email/docs/api/create-dmarc-domain): POST /v1/dmarc/domains
- [List monitored domains](https://sendsend.email/docs/api/list-dmarc-domains): GET /v1/dmarc/domains
- [Get a domain’s DMARC summary](https://sendsend.email/docs/api/get-dmarc-domain): GET /v1/dmarc/domains/{id}
- [List who sends as your domain](https://sendsend.email/docs/api/list-dmarc-sources): GET /v1/dmarc/domains/{id}/sources
- [Stop monitoring a domain](https://sendsend.email/docs/api/delete-dmarc-domain): DELETE /v1/dmarc/domains/{id}
- [Monitor a domain or IP for blocklists](https://sendsend.email/docs/api/create-blocklist-monitor): POST /v1/blocklist/monitors
- [List blocklist monitors](https://sendsend.email/docs/api/list-blocklist-monitors): GET /v1/blocklist/monitors
- [Get a blocklist monitor](https://sendsend.email/docs/api/get-blocklist-monitor): GET /v1/blocklist/monitors/{id}
- [Check a monitor now](https://sendsend.email/docs/api/check-blocklist-monitor): POST /v1/blocklist/monitors/{id}/check
- [Stop monitoring](https://sendsend.email/docs/api/delete-blocklist-monitor): DELETE /v1/blocklist/monitors/{id}
- [Create an audience](https://sendsend.email/docs/api/create-audience): POST /v1/audiences
- [List audiences](https://sendsend.email/docs/api/list-audiences): GET /v1/audiences
- [Retrieve an audience](https://sendsend.email/docs/api/get-audience): GET /v1/audiences/{id}
- [Delete an audience](https://sendsend.email/docs/api/delete-audience): DELETE /v1/audiences/{id}
- [Create a contact](https://sendsend.email/docs/api/create-contact): POST /v1/audiences/{id}/contacts
- [Import contacts](https://sendsend.email/docs/api/import-contacts): POST /v1/audiences/{id}/contacts/import
- [List contacts](https://sendsend.email/docs/api/list-contacts): GET /v1/audiences/{id}/contacts
- [Retrieve a contact](https://sendsend.email/docs/api/get-contact): GET /v1/audiences/{id}/contacts/{contact}
- [Update a contact](https://sendsend.email/docs/api/update-contact): PATCH /v1/audiences/{id}/contacts/{contact}
- [Delete a contact](https://sendsend.email/docs/api/delete-contact): DELETE /v1/audiences/{id}/contacts/{contact}
- [List a contact’s topics](https://sendsend.email/docs/api/get-contact-topics): GET /v1/audiences/{id}/contacts/{contact}/topics
- [Update a contact’s topics](https://sendsend.email/docs/api/update-contact-topics): PATCH /v1/audiences/{id}/contacts/{contact}/topics
- [Create a contact property](https://sendsend.email/docs/api/create-contact-property): POST /v1/contact-properties
- [List contact properties](https://sendsend.email/docs/api/list-contact-properties): GET /v1/contact-properties
- [Retrieve a contact property](https://sendsend.email/docs/api/get-contact-property): GET /v1/contact-properties/{id}
- [Update a contact property](https://sendsend.email/docs/api/update-contact-property): PATCH /v1/contact-properties/{id}
- [Delete a contact property](https://sendsend.email/docs/api/delete-contact-property): DELETE /v1/contact-properties/{id}
- [Create a topic](https://sendsend.email/docs/api/create-topic): POST /v1/topics
- [List topics](https://sendsend.email/docs/api/list-topics): GET /v1/topics
- [Retrieve a topic](https://sendsend.email/docs/api/get-topic): GET /v1/topics/{id}
- [Update a topic](https://sendsend.email/docs/api/update-topic): PATCH /v1/topics/{id}
- [Delete a topic](https://sendsend.email/docs/api/delete-topic): DELETE /v1/topics/{id}
- [Create a segment](https://sendsend.email/docs/api/create-segment): POST /v1/segments
- [Preview a segment](https://sendsend.email/docs/api/preview-segment): POST /v1/segments/preview
- [List segments](https://sendsend.email/docs/api/list-segments): GET /v1/segments
- [Retrieve a segment](https://sendsend.email/docs/api/get-segment): GET /v1/segments/{id}
- [Update a segment](https://sendsend.email/docs/api/update-segment): PATCH /v1/segments/{id}
- [Delete a segment](https://sendsend.email/docs/api/delete-segment): DELETE /v1/segments/{id}
- [List a segment’s contacts](https://sendsend.email/docs/api/list-segment-contacts): GET /v1/segments/{id}/contacts
- [Create a signup form](https://sendsend.email/docs/api/create-form): POST /v1/forms
- [List signup forms](https://sendsend.email/docs/api/list-forms): GET /v1/forms
- [Retrieve a signup form](https://sendsend.email/docs/api/get-form): GET /v1/forms/{id}
- [Update a signup form](https://sendsend.email/docs/api/update-form): PATCH /v1/forms/{id}
- [Delete a signup form](https://sendsend.email/docs/api/delete-form): DELETE /v1/forms/{id}
- [Create a broadcast](https://sendsend.email/docs/api/create-broadcast): POST /v1/broadcasts
- [List broadcasts](https://sendsend.email/docs/api/list-broadcasts): GET /v1/broadcasts
- [Retrieve a broadcast](https://sendsend.email/docs/api/get-broadcast): GET /v1/broadcasts/{id}
- [Get broadcast stats](https://sendsend.email/docs/api/get-broadcast-stats): GET /v1/broadcasts/{id}/stats
- [List clicked links](https://sendsend.email/docs/api/list-broadcast-links): GET /v1/broadcasts/{id}/links
- [Duplicate a broadcast](https://sendsend.email/docs/api/duplicate-broadcast): POST /v1/broadcasts/{id}/duplicate
- [Update a broadcast](https://sendsend.email/docs/api/update-broadcast): PATCH /v1/broadcasts/{id}
- [Delete a broadcast](https://sendsend.email/docs/api/delete-broadcast): DELETE /v1/broadcasts/{id}
- [Send a broadcast](https://sendsend.email/docs/api/send-broadcast): POST /v1/broadcasts/{id}/send
- [Cancel a broadcast](https://sendsend.email/docs/api/cancel-broadcast): POST /v1/broadcasts/{id}/cancel
- [Get the receiving address](https://sendsend.email/docs/api/get-inbound-address): GET /v1/inbound
- [List received emails](https://sendsend.email/docs/api/list-received-emails): GET /v1/received-emails
- [Retrieve a received email](https://sendsend.email/docs/api/get-received-email): GET /v1/received-emails/{id}
- [Download the original message](https://sendsend.email/docs/api/get-received-email-raw): GET /v1/received-emails/{id}/raw
- [List attachments](https://sendsend.email/docs/api/list-received-attachments): GET /v1/received-emails/{id}/attachments
- [Download an attachment](https://sendsend.email/docs/api/get-received-attachment): GET /v1/received-emails/{id}/attachments/{attachment}
- [Delete a received email](https://sendsend.email/docs/api/delete-received-email): DELETE /v1/received-emails/{id}
- [Receive on your own domain](https://sendsend.email/docs/api/create-inbound-domain): POST /v1/inbound/domains
- [List inbound domains](https://sendsend.email/docs/api/list-inbound-domains): GET /v1/inbound/domains
- [Retrieve an inbound domain](https://sendsend.email/docs/api/get-inbound-domain): GET /v1/inbound/domains/{id}
- [Check an inbound domain now](https://sendsend.email/docs/api/verify-inbound-domain): POST /v1/inbound/domains/{id}/verify
- [Stop receiving on a domain](https://sendsend.email/docs/api/delete-inbound-domain): DELETE /v1/inbound/domains/{id}
- [Create an API key](https://sendsend.email/docs/api/create-api-key): POST /v1/api-keys
- [List API keys](https://sendsend.email/docs/api/list-api-keys): GET /v1/api-keys
- [Update an API key](https://sendsend.email/docs/api/update-api-key): PATCH /v1/api-keys/{id}
- [Revoke an API key](https://sendsend.email/docs/api/revoke-api-key): DELETE /v1/api-keys/{id}
- [List request logs](https://sendsend.email/docs/api/list-logs): GET /v1/logs
- [Retrieve a request log](https://sendsend.email/docs/api/get-log): GET /v1/logs/{id}
- [Retrieve usage](https://sendsend.email/docs/api/get-usage): GET /v1/usage
- [Retrieve metrics](https://sendsend.email/docs/api/get-metrics): GET /v1/metrics

## What SendSend does

- Send, schedule, batch (up to 100 per request), and cancel email through a REST API, with idempotency keys so a retry never sends twice.
- A test mode that simulates delivery, bounces and complaints without sending real email.
- Domain verification with per-record DNS checks, DKIM, SPF and DMARC guidance, deliverability insights per domain, optional open and click tracking, and optional TLS-only delivery.
- Signed, retried webhooks for delivery, bounce, complaint, open, click and received-mail events.
- Audiences, contacts, topics, segments, a visual broadcast editor, signup forms with double opt-in, one-click unsubscribe, and per-broadcast statistics.
- Inbound email: an address for every project or your own domain, an inbox, an API, and a webhook.
- Projects for each app or client, scoped API keys, team roles, read-only client seats, and an audit log.
- Hard spending caps, so sending stops at the limit instead of producing a surprise bill.
- Libraries for Python, PHP, Ruby, Go, .NET, Java and Rust, a Node SDK, a command-line tool, an MCP server (also hosted, so assistants connect with a URL), email address verification, DMARC monitoring, blocklist monitoring, broadcast split testing, a visual template builder with a library of sixty ready-made templates including WooCommerce, a WordPress plugin, and guides for 16 frameworks, Zapier, Make, n8n, Supabase and Clerk.