It sounds like from that example that you could do that with For or Foreach Loop container to loop through your emails and do the appropriate operations instead of maybe embedding that logic in a script task.

This is the beauty of SSIS, Microsoft has provided us a rich tool to do work the way we want to.

In my opinion and personal best practice, a script task is a last resort to add functionality that isn't already present in SSIS. They aren't as maintainable in the long run, and they obfuscate their true function in the package by being able to execute any number of operations that maybe aren't detailed in the task's name or some comments.