Requirements: a Brevo account with access to SMTP & API (section 2).
- Log in to your Brevo account and go to Account → SMTP & API (
app.brevo.com/settings/keys/api). - Select the API keys tab.
- Click Generate a new API key.
- Give it a recognizable name — for example your own business’s name, never a generic one like “test”.
- 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).