---
ref: tool:mailchimp/send-campaign
name: Send a campaign
company: company:mailchimp
workflows: []
access: [api]
tags: [capability:send-email, category:email, has:api]
docs: https://mailchimp.com/developer/marketing/api/campaigns/send-campaign/
updated: 2026-09-27
---

# Send a campaign

Sends a campaign to its recipients right away; an RSS campaign sends on its schedule instead.

Note: Sends to real people: confirm the campaign and its audience with the user first. Resolve what `GET /campaigns/{campaign_id}/send-checklist` lists before sending.

## Set up

Use the first option your agent supports.

### API (official)

- Base URL: https://{dc}.api.mailchimp.com/3.0
- Endpoint: `POST /campaigns/{campaign_id}/actions/send`
- Auth: send the header `Authorization: Bearer $MAILCHIMP_API_KEY`
- Get a key: https://us1.admin.mailchimp.com/account/api/
- Docs: https://mailchimp.com/developer/marketing/api/

Note: `{dc}` is your data center, the part of the API key after the dash, such as `us6`.

Before anything else, confirm access with the cheapest read-only call, like a list or a search. Never send or change anything to test access.

## Rules

- Ask the user before anything that sends messages, costs money, or changes data, and say how many records it touches. One approval covers a batch the user has seen.
- Never print API keys.