It may be an AWS limitation if your SMTP server listens on port 25. Please see this article for more information: https://aws.amazon.com/premiumsupport/knowledge-center/ec2-port-25-throttle/
Articles in this section
- Why did I get this error: ERR_BLOCKED_BY_CLIENT?
- Error Troubleshooting Guide
- When installing Kion with a custom AMI, why did I get this error: "ValidationError: Stack {Stack Name} is in CREATE_COMPLETE/UPDATE-COMPLETE state and cannot be signaled"?
- When trying to access the web console, why did I get this error: "trouble getting credentials from DB"?
- Why are new cached accounts displaying as "inaccessible" if they were created in v2.15.4 or older?
- Why did I get this error: "Error getting commercial keys from DB. ct key not found"?
- AWS: Why did I get this error: "Template error: Fn::Select cannot select nonexistent value at index" when deploying the Kion VPC template in AWS?
- Why do I occasionally get this error: "Could not connect to Kion"?
- Why are emails from Kion being throttled?