---
title: Email not delivered
description: Diagnose why an email sent through Retidal isn't reaching the recipient.
---

## Symptom

An email sent through Retidal is not delivered — no send confirmation, the message bounces, or it never reaches the recipient's inbox.

## Likely causes

1. **The email provider (ESP) currently routing this category is degraded or down.**

   Console → Projects → Email — check provider status; if one ESP is failing, traffic for its routed categories should already be moved to an alternate provider.

2. **A domain's DKIM signing key is out of date or unverified**, for example after a rotation didn't finish on every provider for that domain.

   Console → Projects → Email — check the domain's DKIM status; anything other than "valid" will fail or land in spam for sends from that domain.

3. **Synthetic deliverability probe thresholds have been crossed** for this ESP/domain pair (falling inbox rate, rising latency, or a high timeout rate).

   Console → Projects → Email — deliverability metrics for the affected domain and provider.

4. **The recipient address is on the suppression list** (added directly, or as part of a bulk migration).

   Console → Projects → Email — suppression list, search for the recipient's address.

## Still stuck

If the signals above look normal and delivery still fails, escalate with the message id and recipient address, or work through the [health checklist](/docs/troubleshooting/health-checklist).