How to test SMTP Errors
If for any reason you want to test how our SMTP API Errors work, you can follow this 2-step process.
1. Enable the SMTP API Errors for a Server
You can use this in your Mac terminal or API Explorer to run the code in these docs, and enable SMTP API Errors:
2. Test sending to an inactive recipient via SMTP
You can use a 3rd party service Online SMTP Test - Send and Check your Email Server , just ensure that your API Token is rotated afterwards.