---
title: Troubleshooting
description: Common issues and solutions
icon: Bug
---

## Authentication

**Invalid API key:**
- Secret keys start with `sk_`, public keys with `pk_`
- Use `Authorization: Bearer sk_your_secret_key`

**Wrong key type:**
- Public keys (`pk_`) only work with `/v1/track`
- All other endpoints require secret keys (`sk_`)

## Emails not sending

1. **Billing limit reached** — Check Settings → Billing
2. **Template not found** — Verify template ID exists
3. **Contact unsubscribed** — Marketing templates skip unsubscribed contacts

## Emails going to spam

1. Set up a custom domain
2. Clean your list (remove bounces)
3. Warm up new domains gradually

## Workflows not triggering

1. **Workflow not enabled** — Check toggle is ON
2. **Wrong event name** — Names are case-sensitive
3. **Already entered** — If re-entry disabled, contact can only enter once

## Rate limiting (429)

- Wait and retry
- Batch multiple recipients in one request
- Spread requests over time

## Request IDs

Every API response includes `X-Request-ID` header. Include this when contacting support.