Need proof that distribution groups copy email to mailboxes...

My supervisor doesn't believe me when I say that distribution groups work like this:

Mail is received, copies of mail are sent to members of distribution group. Distribution group does not retain the message anywhere since it's not a mailbox.

I suppose I could be wrong, but fundamentally I was under the impression that's how they work. That's how I learned it anyway. Does anyone have a link or anything to something official that explains this so I can move on?

This is a silly request, I know.
Jason ParadisIT Operations SpecialistAsked:
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Daryl BamforthTechnical ExpertCommented:
It depends upon the type of 'distribution' list you are referring to. A mailing list can be set to retain email messages or delete them. This is how groups  Email distribution lists don't necessarily have a mailbox, in outlook once you hit send, in effect it expands the list and sends directly to each person on the distribution list.
Alexei KuznetsovMicrosoft Outlook MVPCommented:
First of all, make sure your distribution group is actually a group and not a shared mailbox or Exchange Public Folder. If it's actually group then of course, it works like you described: each member gets a copy of email.

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