Email Distribution List in Outlook for External Users

Hi,

Is there a way to create a distribution list in Outlook 365 for a group of external users e.g. my clients?

The important requirement is that they should not be able to see each others' email addresses, nor should they be able to email each other by clicking reply or reply all. So, it's kind of an old fashioned distribution list but only I can send emails to members and if anyone replies to the email, it should come back to me.

I checked the "Contact Group" in Outlook but that displays each member's name/email so that wouldn't work.