If you are concerned about how it will run in a job, you can deploy it to a test machine with the job service running under the same credentials ...security context as the one on the production system. See if you can access the needed outside resources that way. Though that would depend on your situation if this is even possible.

Note: Some systems cannot run the DTEXEC because the command shell is not on due to security. Here you can simply define the job step as a integration services package.