The SMTP checker tool obtained this information
2020/09/26 01:38:54 Found errors when checking the SMTP configuration:
x509: certificate is valid for *.thundercloud.uk, thundercloud.uk, not smtp.incept.io
Using SMTP credentials:
- SMTP Host: "smtp.incept.io"
- SMTP Port: 587
It seems the certificate of the SMTP provider you have doesn't match with the domain name you are using when configuring the SMTP settings. That may cause the error in the application and that's why the application is failing. Can you try with a different cloud provider to confirm that everything works as expected when using that other provider?