**Requirements:** a Brevo account with access to SMTP & API (section 2). 1. Log in to your Brevo account and go to **Account → SMTP & API** (`app.brevo.com/settings/keys/api`). 2. Select the **API keys** tab. 3. Click **Generate a new API key**. 4. Give it a recognizable name — for example your own business's name, never a generic one like "test". 5. Click **Generate**. Brevo shows the full key only once — copy it before closing the dialog: you won't be able to see it in full again afterward. > **Warning — This is not the MCP server key** > > Brevo also offers a separate key for its official MCP server ("MCP key") — this integration **never** connects to that MCP server, so that key doesn't work here. Always use the classic **v3** API key from the API keys tab. > **Note — "Successful connection" doesn't yet mean "successful sending"** > > Before transactional email sending actually works you also need, besides the key, a **verified sender** in your Brevo account (a 6-digit code by email, a matter of minutes) or an **authenticated domain** (SPF/DKIM/DMARC records). You can do this before or after connecting — the connection itself doesn't depend on it, but the "Send transactional email" action (section 5) does. Verified against Brevo's official documentation (`developers.brevo.com/docs/authentication` and `app.brevo.com/settings/keys/api`, checked on September 5, 2026).