Send an email
POST /api/emails with a Bearer key. Each recipient in to, cc, and bcc counts as one email.
curl -X POST http://localhost:4000/api/emails \
-H "Authorization: Bearer sf_your_key" \
-H "Content-Type: application/json" \
-d '{
"from": "Ada <ada@yourdomain.com>",
"to": ["person@example.com"],
"subject": "Welcome",
"html": "<p>Hello</p>"
}'