{
  "error": {
    "code": "sender_not_verified",
    "message": "The domain 'gmail.com' is not verified.",
    "docs_url": "https://docs.send0.dev/errors/sender_not_verified",
    "status": 422
  }
}

{
  "error": {
    "code": "validation_error",
    "message": "Request validation failed.",
    "status": 422,
    "errors": [
      {
        "param": "to",
        "code": "too_many_recipients",
        "message": "Maximum 50 recipients allowed."
      },
      {
        "param": "subject",
        "code": "required",
        "message": "Subject is required."
      }
    ]
  }
}

import { Send0, Send0APIError, Send0RateLimitError } from 'send0';

const send0 = new Send0('sk_live_...');

try {
  await send0.emails.send({
    from: 'hello@yourdomain.com',
    to: 'user@example.com',
    subject: 'Hello',
    html: '<p>Hello</p>',
  });
} catch (err) {
  if (err instanceof Send0RateLimitError) {
    console.log(`Rate limited. Retry after ${err.retryAfter}s`);
  } else if (err instanceof Send0APIError) {
    console.log(`API error: ${err.code} — ${err.message}`);
  }
}