Read and Write Gmail Messages Keywords

Hi,

I am using the following plugin to read the message content from Gmail.

https://store.katalon.com/product/39/Read-and-Write-Gmail-Messages-Keywords

The test runs successfully without any issues on my local machine, but when I am running the test through CI/CD pipeline, the test failed on the step where it is using this plugin.

Does someone knows what to do here? Do I need to do something on my pipeline settings?

Also, when I am running the tests on the client VPN, it gives me the following error:

org.codehaus.groovy.runtime.InvokerInvocationException: javax.mail.MessagingException: Connection refused: connect;
nested exception is:
java.net.ConnectException: Connection refused: connect
at com.testwithhari.katalon.plugins.Gmail.invokeMethod(Gmail.groovy)

Has someone came across these issues before?