# Sendly

> Sendly is an email platform for developers — one REST API for transactional email, marketing
> campaigns, and visual automation workflows, built on AWS SES, with contacts, segments, templates,
> webhooks and an event stream behind the same account. It offers a free tier and metered
> pay-as-you-go sending.

sendly.now is the marketing site; it carries an overview, the capability list and pricing. Anything
technical lives on the documentation site, which publishes its own machine-readable index of every
page — follow that first rather than scraping this one.

## Documentation

- [Docs index for LLMs](https://docs.sendly.now/llms.txt): every documentation page, each listed with a plain-Markdown URL alongside its canonical one.
- [Documentation home](https://docs.sendly.now): guides, concepts and reference.
- [FAQ](https://docs.sendly.now/faq): answers about agents, pricing and SDKs.
- [Agent setup prompt](https://docs.sendly.now/agent-setup/prompt.md): fetch and run this to connect an AI coding agent to Sendly over MCP or the SDK.
- [Add Sendly to Claude](https://claude.ai/directory/e2cba79c-6e59-4784-af25-93ce631ad368): Sendly's listing in Claude's connector directory; click Connect, then sign in. It connects Sendly's MCP server (https://app.sendly.now/api/mcp).
- [Sendly in ChatGPT](https://chatgpt.com/plugins/plugin_asdk_app_6aa1f9e289d881919b9e52044c229dec): Sendly's published ChatGPT app; click Connect, then sign in.
- [API reference](https://docs.sendly.now/api-reference/overview): the full REST surface.
- [SDKs](https://docs.sendly.now/sdks): the official TypeScript/JavaScript and Python clients.
- [Migrate from another provider](https://docs.sendly.now/migrate): Sendly's API also speaks the transactional-send dialects of Resend, SendGrid, Postmark, Mailgun and Plunk, so an existing vendor SDK works after swapping the base URL and API key.
- [MCP for AI agents](https://docs.sendly.now/guides/mcp): connect an MCP client over OAuth to read a Sendly account.

## This site

- [Home](https://sendly.now): what Sendly does, capabilities and pricing.
- [Pricing](https://sendly.now/pricing): the free tier and metered pay-as-you-go rates.
- [For developers](https://sendly.now/developers): the API, SDKs, webhooks, event stream and MCP access.
- [For AI agents](https://sendly.now/agents): MCP access with the permissions you choose.
- [Apps](https://sendly.now/apps): installing Sendly as an app from the browser; the App Store, Google Play and Microsoft Store listings are in preparation.
- [Browser extension](https://sendly.now/extension): a Chrome extension that shows what your Sendly emails sent, delivered or bounced: delivery timelines, events, domain health and raw API requests; available on the [Chrome Web Store](https://chromewebstore.google.com/detail/sendly-email-api-debugger/lhfgfaabmngpkogibiofhkdbomjcndbg).
- [Microsoft 365 Copilot](https://sendly.now/integrations/microsoft-copilot): the Sendly agent for Microsoft 365 Copilot, which reads delivery status, sending domains, contacts and campaign results, and adds a contact or sends an email only after you confirm; submitted to Microsoft and not yet listed in its store.
- [Slack](https://sendly.now/integrations/slack): the Sendly app for Slack, which posts delivery alerts (bounce and complaint spikes, failed sends, finished campaigns, domain results) into one channel and answers `/sendly stats` and `/sendly domains`; posts carry counts only, never a recipient's address.
- [Trust](https://sendly.now/trust): what Sendly commits to and what it deliberately does not — data export, price-change notice, published sending limits and appeals.
- [Changelog](https://sendly.now/changelog): what changed in Sendly, and when.
- [Refer & Earn](https://sendly.now/partners): the referral programme and its terms.
- [Terms](https://sendly.now/terms)
- [Privacy](https://sendly.now/privacy)

## Comparisons

- [Alternatives](https://sendly.now/alternatives): how Sendly compares with the email providers people move from, and which of them Sendly can accept a send from without a rewrite.
- [Sendly vs Resend](https://sendly.now/vs/resend): A transactional email API. Sendly is that plus campaigns, workflows and inbound mail.
- [Sendly vs SendGrid](https://sendly.now/vs/sendgrid): The incumbent. Sendly is a smaller surface with one metered price per email.
- [Sendly vs Mailchimp](https://sendly.now/vs/mailchimp): A marketing suite operated from a dashboard. Sendly is operated from an API.
- [Sendly vs Customer.io](https://sendly.now/vs/customer-io): Multi-channel messaging. Sendly does the email channel of that job and nothing else.
- [Sendly vs Mailgun](https://sendly.now/vs/mailgun): An email API with deliverability tooling. Sendly adds the marketing half.

## Migration guides

- [Migrate to Sendly](https://sendly.now/migrate): the five providers whose transactional-send API Sendly accepts as-is, and how to switch.
- [Migrate from Resend](https://sendly.now/migrate/resend): Set baseUrl on the Resend client, or the RESEND_BASE_URL variable.
- [Migrate from SendGrid](https://sendly.now/migrate/sendgrid): Set the base URL on @sendgrid/client after setApiKey, which resets it.
- [Migrate from Postmark](https://sendly.now/migrate/postmark): Override the request host on the Postmark client.
- [Migrate from Mailgun](https://sendly.now/migrate/mailgun): Pass url on the mailgun.js client, with basic auth as api:<key>.
- [Migrate from Plunk](https://sendly.now/migrate/plunk): Sendly's ancestral API — the closest thing to a drop-in replacement.

## Open source

The Sendly platform itself is not open source. The client libraries are, and take issues and pull
requests:

- [sendly-js](https://github.com/DevinoSolutions/sendly-js): TypeScript/JavaScript SDK.
- [sendly-python](https://github.com/DevinoSolutions/sendly-python): Python SDK.

## Contact

- Support: support@sendly.now
- Security: security@sendly.now