Request for mailing list to learn how to interact with a mailing list

Hello, I have been toying around with a little system like externals.io that lets users and especially newcomers interact more easily with the php mailing lists. As I am not extremely familiar with mailing lists I would like to have a space to fool around and try it out so I can validate that behavior of PHP's configured ezmlm-idk is as I expect it to be. It would help me really much if you could provide a test mailing list for the purpose of learning "how to mailing list" without polluting the main lists. Thank you in advance. Best, Alex