Maintaining a healthy sender reputation is paramount when dispatching transactional and campaign emails through AWS SES. Amazon SES strictly monitors sender metrics: keeping your **bounce rate below 5%** and your **complaint rate below 0.1%** is mandatory to prevent account suspension.
Manually checking the AWS SES console daily is inefficient and risky. In this article, we cover how to automate Amazon SES reputation monitoring using Amazon CloudWatch, SNS, and Webhooks.
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## Key Metrics in the AWS SES Reputation Dashboard
AWS SES reports three critical CloudWatch metrics under the `AWS/SES` namespace:
| Metric | Threshold Limit | Risk Level | Action Required |
| :--- | :--- | :--- | :--- |
| **Reputation.BounceRate** | `< 5.0%` | Critical at 10% | Pause sending & purge hard bounces |
| **Reputation.ComplaintRate**| `< 0.1%` | Critical at 0.5% | Review spam feedback & opt-in flows |
| **SendingQuotaExhaustion** | `< 80.0%` | Warning at 90% | Request quota increase |
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## 1. Creating CloudWatch Alarms for Bounce Rates
You can create an automated CloudWatch alarm that triggers when your 15-minute average bounce rate exceeds **5% (0.05)**.
### Using AWS CLI:
```bash
aws cloudwatch put-metric-alarm \
--alarm-name "AWS_SES_High_Bounce_Rate_Warning" \
--metric-name "Reputation.BounceRate" \
--namespace "AWS/SES" \
--statistic "Average" \
--period 900 \
--threshold 0.05 \
--comparison-operator "GreaterThanOrEqualToThreshold" \
--evaluation-periods 1 \
--alarm-actions "arn:aws:sns:us-east-1:123456789012:SES-Reputation-Alerts"
```
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## 2. Creating CloudWatch Alarms for Complaint Rates
Spam complaints are far more damaging than hard bounces. ISPs like Gmail and Yahoo flag domains quickly if complaints cross **0.1%**.
```bash
aws cloudwatch put-metric-alarm \
--alarm-name "AWS_SES_High_Complaint_Rate_Critical" \
--metric-name "Reputation.ComplaintRate" \
--namespace "AWS/SES" \
--statistic "Average" \
--period 900 \
--threshold 0.001 \
--comparison-operator "GreaterThanOrEqualToThreshold" \
--evaluation-periods 1 \
--alarm-actions "arn:aws:sns:us-east-1:123456789012:SES-Reputation-Alerts"
```
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## 3. Automated Emergency Pause via Webhooks
When an alarm triggers, Amazon SNS can trigger an HTTP Webhook endpoint in your application or gateway to automatically pause non-essential marketing sending queues while preserving critical password reset emails.
### Automated Circuit Breaker Handler Example:
```php
public function handleCloudWatchAlert(Request $request)
{
$payload = json_decode($request->getContent(), true);
if ($payload['AlarmName'] === 'AWS_SES_High_Complaint_Rate_Critical') {
// Automatically pause broadcast campaigns
SystemSetting::set('campaigns_paused', true);
Log::emergency('High SES complaint rate detected. Broadcast campaigns paused automatically.');
}
}
```
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## Summary
Automating your AWS SES reputation monitoring transforms reactive firefighting into proactive reputation protection. By setting CloudWatch alarms for bounce (>5%) and complaint (>0.1%) thresholds, you protect your domain from AWS suspension and maintain top-tier inbox deliverability.