# Rasket

> Rasket is an email API for developers: transactional and marketing email over one REST API, plus Rasket Inbox for business email on your own domain.

Rasket is for developers and the AI agents that work for them. One account covers transactional email (receipts, password resets, alerts), marketing email (contacts, segments, topics, campaigns and automations) and Rasket Inbox (team mailboxes on your own domain).

The REST API base is https://api.rasket.com. Authenticate with `Authorization: Bearer rk_…` (an API key from the dashboard) and send a `User-Agent`; a team may make 10 requests a second.

The OpenAPI 3.1 document is https://www.rasket.com/openapi.json. Every docs page is also Markdown at its URL plus `.md`, and https://www.rasket.com/llms-full.txt is all of them in one file.

## When to use Rasket

- [Send one email](https://www.rasket.com/docs/api-reference/emails.md): `POST /emails` (from, to, subject, html or text). An `Idempotency-Key` header makes a retry within 24 hours safe.
- [Send a batch](https://www.rasket.com/docs/api-reference/emails.md): `POST /emails/batch`: up to 100 emails, validated all or nothing.
- [Schedule a send](https://www.rasket.com/docs/api-reference/emails.md): `scheduled_at` on `POST /emails`: ISO 8601 or a phrase like `tomorrow at 9am`, 1 minute to 30 days ahead.
- [Send a template](https://www.rasket.com/docs/api-reference/templates.md): Versioned templates with typed variables, sent by ID or alias in the `template` field of `POST /emails`.
- [Marketing email](https://www.rasket.com/docs/api-reference/broadcasts.md): Contacts, segments, topics, campaigns (`/broadcasts`) and automations started by your events (`/automations`, `POST /events/send`).
- [Send over SMTP](https://www.rasket.com/docs/smtp.md): smtp.rasket.com on 465 or 587, an API key as the password. Each message is an API send.
- [Receive email](https://www.rasket.com/docs/receiving.md): Publish one MX record; a signed `email.received` webhook names each message, read with `GET /emails/receiving/{email_id}`.
- [Verify a sending domain](https://www.rasket.com/docs/domains.md): `POST /domains` returns the DKIM and SPF records to publish; `POST /domains/{domain_id}/verify` checks them.
- [Hear what happened](https://www.rasket.com/docs/api-reference/webhooks.md): Signed webhooks for delivery, bounce, complaint, open and click, delivered up to 10 times over about 16 hours, replayable.
- [Business email on your domain](https://www.rasket.com/docs/inbox.md): Rasket Inbox: personal and shared team mailboxes at https://inbox.rasket.com. The first mailbox is free.
- [Mail apps](https://www.rasket.com/docs/inbox/mail-apps.md): Coming soon to paid plans.

When not to use it: not for cold or unsolicited email. Marketing mail goes only to people who opted in, never to bought or scraped lists.

## Support inbox

- [Inbox API](https://www.rasket.com/docs/inbox-api.md): Open, read and answer conversations in shared channels from your app. Never personal mailboxes.
- [Support inbox in your app](https://www.rasket.com/docs/inbox-api/support-inbox.md): `POST /inbox/conversations` from a form, with an agent prompt.
- [Replies to your emails](https://www.rasket.com/docs/inbox-api/replies.md): `inbox` on `POST /emails` turns replies into conversations.
- [Agent triage](https://www.rasket.com/docs/inbox-api/agents.md): MCP `?toolset=inbox`; drafts for a person.
- [Inbox reference](https://www.rasket.com/docs/api-reference/inbox.md): Keys need Inbox access (none until an admin sets it); scopes `inbox:read`, `inbox:write`.

## Quickstart for agents

- [MCP server](https://www.rasket.com/docs/mcp.md): https://api.rasket.com/mcp, Streamable HTTP, OAuth sign-in (no API key in the client): `claude mcp add --transport http rasket https://api.rasket.com/mcp`
- [MCP discovery](https://www.rasket.com/.well-known/mcp.json): Endpoint, transport and OAuth metadata as JSON.
- [Setup skill](https://www.rasket.com/skills/rasket-setup/SKILL.md): Agent Skill: key, domain, DNS, first send, webhook. Index: /.well-known/agent-skills/index.json.
- [Agents guide](https://www.rasket.com/docs/agents.md): Let an AI agent set Rasket up: the skill, the rules file, MCP, and the recipe they share.
- [Quickstart](https://www.rasket.com/docs/quickstart.md): Key, domain, first send — in that order.
- [OpenAPI document](https://www.rasket.com/openapi.json): OpenAPI 3.1: every endpoint and schema.
- [Node SDK](https://www.rasket.com/docs/sdk/node.md): A typed client, not yet published to npm: use the REST API or MCP until it is.
- [Python SDK](https://www.rasket.com/docs/sdk/python.md): A typed client, not yet published to PyPI: use the REST API or MCP until it is.

## Pricing

- [Transactional plans](https://www.rasket.com/pricing.md): Free: $0 a month for 3,000 emails. Pro: from $20 a month for 50,000 emails. Scale: from $90 a month for 100,000 emails. Custom: a contract for 3,000,000+ emails a month. Emails past the quota from $0.25 per 1,000. Pay yearly to save 20%.
- [Marketing contacts](https://www.rasket.com/pricing.md): Marketing email is included in every plan: 400 contacts on Free, more on paid plans. With pay-as-you-go on, each contact past that is billed at the plan's per-contact rate, on the month's peak, in blocks of 1,000.
- [Rasket Inbox](https://www.rasket.com/products/inbox): Rasket Inbox: business email on your own domain. Mailboxes included per plan: Free 1, Pro 3, Scale 5. Each extra mailbox, shared or personal, is $5 a month.

## Docs

- [Docs overview](https://www.rasket.com/docs.md): Every docs page, grouped, with what exists today.
- [Quickstart](https://www.rasket.com/docs/quickstart.md): Key, domain, first send — in that order.
- [Authentication](https://www.rasket.com/docs/authentication.md): Bearer keys, the mandatory User-Agent, and what each refusal means.
- [Emails](https://www.rasket.com/docs/api-reference/emails.md): Send, batch, retrieve, list, reschedule, cancel, attachments.
- [Domains](https://www.rasket.com/docs/domains.md): The records, where they go at each registrar, and what the page does while you wait.
- [Events](https://www.rasket.com/docs/events.md): Every event a webhook can carry, with one real payload each.
- [Webhooks](https://www.rasket.com/docs/api-reference/webhooks.md): Payloads, signature verification, retries and replay.
- [Templates](https://www.rasket.com/docs/api-reference/templates.md): Versioned email content with typed variables, addressed by ID or alias.
- [Campaigns](https://www.rasket.com/docs/api-reference/broadcasts.md): Campaigns, at /broadcasts: one message to a segment, from draft to results.
- [Automations](https://www.rasket.com/docs/api-reference/automations.md): Workflows that run per contact: the graph, its versions, and every run.
- [Receiving](https://www.rasket.com/docs/receiving.md): Inbound mail, and the Inbox: a webhook fires, you read it, you answer it.
- [Errors](https://www.rasket.com/docs/errors.md): The whole vocabulary, with the status each name carries.
- [Rate limits](https://www.rasket.com/docs/rate-limits.md): Ten a second per team, and the headers that tell you where you are.
- [All docs in one file](https://www.rasket.com/llms-full.txt): Every docs page as Markdown, in sidebar order.

## Guides

- [Marketing email: types, rules and examples](https://www.rasket.com/guides/marketing-email): Lifecycle email guide, with sources.
- [Contact email: which address to publish](https://www.rasket.com/guides/contact-email): Lifecycle email guide, with sources.
- [What is SMTP? How email actually gets delivered](https://www.rasket.com/guides/smtp): Authentication guide, with sources.
- [How to get out of the Gmail Promotions tab](https://www.rasket.com/guides/gmail-promotions-tab): Deliverability guide, with sources.
- [Why are my emails going to spam? How to fix it](https://www.rasket.com/guides/emails-going-to-spam): Deliverability guide, with sources.
- [Gmail bulk sender requirements: the full checklist](https://www.rasket.com/guides/gmail-yahoo-sender-requirements): Deliverability guide, with sources.
- [How to write a welcome email that gets read](https://www.rasket.com/guides/welcome-email-best-practices): Lifecycle email guide, with sources.
- [Email list cleaning: sunset inactive subscribers](https://www.rasket.com/guides/sunset-inactive-subscribers): Deliverability guide, with sources.
- [How to set up one-click unsubscribe (RFC 8058)](https://www.rasket.com/guides/one-click-unsubscribe): Deliverability guide, with sources.
- [How to lower your email spam complaint rate](https://www.rasket.com/guides/spam-complaint-rate): Deliverability guide, with sources.
- [How to warm up a new domain or IP address](https://www.rasket.com/guides/domain-ip-warm-up): Deliverability guide, with sources.
- [Google Postmaster Tools, explained](https://www.rasket.com/guides/google-postmaster-tools): Deliverability guide, with sources.
- [DMARC p=reject: move from p=none safely](https://www.rasket.com/guides/dmarc-none-to-reject): Authentication guide, with sources.
- [Should you use an email subdomain for marketing?](https://www.rasket.com/guides/marketing-email-subdomain): Deliverability guide, with sources.
- [All guides](https://www.rasket.com/guides.md): Every guide with its short answer, as Markdown.

## Compare

- [Compare email APIs](https://www.rasket.com/compare): Rasket compared with Resend, SendGrid, Postmark, Mailgun, MailerSend and Brevo on the rows a developer buys on, every fact checked against their public pages.
- [Rasket vs Resend](https://www.rasket.com/compare/rasket-vs-resend): Side by side, with sources.
- [Rasket vs SendGrid](https://www.rasket.com/compare/rasket-vs-sendgrid): Side by side, with sources.
- [Rasket vs Postmark](https://www.rasket.com/compare/rasket-vs-postmark): Side by side, with sources.
- [Rasket vs Mailgun](https://www.rasket.com/compare/rasket-vs-mailgun): Side by side, with sources.
- [Rasket vs MailerSend](https://www.rasket.com/compare/rasket-vs-mailersend): Side by side, with sources.
- [Rasket vs Brevo](https://www.rasket.com/compare/rasket-vs-brevo): Side by side, with sources.
- [Alternatives](https://www.rasket.com/alternatives): Alternatives to Resend, SendGrid, Postmark, Mailgun, weighed with sources.

## Blog

- [Best transactional email API: seven compared](https://www.rasket.com/blog/best-transactional-email-api.md): Seven transactional email APIs compared on inbound, campaigns, webhooks, idempotency and price, with every competitor cell linked to the vendor's own page.
- [Email deliverability guide for developers](https://www.rasket.com/blog/email-deliverability-guide.md): Delivered is not the same as inboxed. Authentication, domain reputation, list hygiene, the headers bulk senders need, and the numbers worth watching every week.
- [DKIM, SPF and DMARC explained for developers](https://www.rasket.com/blog/dkim-spf-dmarc-explained.md): What SPF, DKIM and DMARC each prove, the records to publish, how alignment ties them together, and what the large mailbox providers now require of senders.
- [Transactional vs marketing email: how to send each](https://www.rasket.com/blog/transactional-vs-marketing-email.md): What separates transactional email from marketing email — the trigger, consent, unsubscribe headers and reputation — and how to send both from one API.
- [Let an AI agent send email with MCP](https://www.rasket.com/blog/ai-agent-send-email-mcp.md): Connect an assistant to an email API over MCP: what the server exposes, the scopes it asks for, the first call it makes, and the guardrails that keep it safe.
- [All posts](https://www.rasket.com/blog.md): Every post, by its Markdown URL.

## Changelog

- [2026-10-06: Mail apps, coming soon](https://www.rasket.com/changelog/mail-apps): Rasket Inbox in Apple Mail, Outlook and the Gmail app is coming soon to the paid plans.
- [2026-09-29: Send over SMTP](https://www.rasket.com/changelog/send-over-smtp): Point anything that only sends over SMTP at smtp.rasket.com, with an API key as the password.
- [2026-09-26: Broadcasts are now Campaigns](https://www.rasket.com/changelog/broadcasts-are-now-campaigns): The dashboard section you send to your audience from is called Campaigns, and every old link still works.
- [2026-09-26: Starters open in the visual editor](https://www.rasket.com/changelog/starters-open-in-the-visual-editor): Start from any of the seven starter emails and the copy opens in the drag-and-drop editor, not as HTML.
- [Full changelog](https://www.rasket.com/changelog.md): Everything that shipped, dated, newest first.

## Support

- [Contact](https://www.rasket.com/contact): Send Rasket a message about sales, support, billing or security. A person reads every one and replies by email.
- [Support in the dashboard](https://www.rasket.com/login): Signed-in users open a support ticket under Settings, Support; replies arrive in the thread and by email.
- [For agents: diagnosing a send](https://www.rasket.com/docs/api-reference/logs.md): There is no support API. Read the email's timeline (`GET /emails/{email_id}/events`) and the request logs (`GET /logs`), then draft the support request for the user to send.

## Company

- [About](https://www.rasket.com/about): What Rasket is and who builds it.
- [Security](https://www.rasket.com/security): Isolation, encryption, hashed keys, signed webhooks, MFA, SSO, audit log.
- [Enterprise](https://www.rasket.com/enterprise): Volume past 3,000,000 emails a month, dedicated IPs, SSO, invoicing. Talk to sales: https://www.rasket.com/enterprise#contact-sales.
- [Terms](https://www.rasket.com/terms): Terms of service, including acceptable use.
- [Privacy](https://www.rasket.com/privacy): The privacy policy.
- [DPA](https://www.rasket.com/dpa): The Data Processing Addendum for personal data we process for customers.
- [Subprocessors](https://www.rasket.com/subprocessors): Who processes personal data for us, and where.
- [Editorial policy](https://www.rasket.com/editorial-policy): Who writes the guides and how facts are checked.

## Optional

- [Glossary](https://www.rasket.com/glossary): Plain definitions of the words that turn up in email infrastructure: DKIM, SPF, DMARC, bounces, complaints, suppressions, idempotency, webhooks and more.
- [Email API by stack](https://www.rasket.com/email-api): Send email from Node.js, Next.js, Python, Django, FastAPI, Rails, Laravel, Go, Bun, Deno, Cloudflare Workers or Supabase: one key, one POST, one sample.
- [Features](https://www.rasket.com/features): Every feature page: API, webhooks, domains, receiving, templates, campaigns, automations, agents.
- [All comparisons](https://www.rasket.com/compare.md): Every comparison and alternatives page, as Markdown.