curl -X POST https://api.mailofly.com/suppressions \
  -H "Authorization: Bearer mf_live_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "email": "baduser@example.com",
    "reason": "complaint"
  }'

{
  "data": {
    "id": "sup_123",
    "email": "baduser@example.com",
    "reason": "complaint",
    "created_at": "2026-09-11T14:00:00Z"
  }
}