---
title: Errors
description: Handle stable sently error codes and provider-specific error instances.
icon: CircleAlert
source: "src/core/errors.ts"
---

All library transport and protocol failures derive from `SentlyError`; use `sentlyCode` for stable handling.

```ts
import { SentlyError } from "sently/errors";

try {
  await mailer.send(message);
} catch (error) {
  if (error instanceof SentlyError) console.error(error.sentlyCode);
}
```

Provider error classes also retain provider response details where their transport exposes them.

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