Re: Two obvious problems here
Yes and no...
A Mailling list ( since that's what it appears to be ) is just a mail forwarder. It has a list of addresses to foward any emails it receives to....
It's not like a group in Outlook.
If it's configured correctly, it sets the Reply-To: field to the mailling list address, and sends an email ti receives in the form of an individual emails to each list member with one single member a recipient of said individual email.
IWith the Reply-To field set to the mailing list address, if somebody reply to the original mail, everybody in the list will receive the reply.
With a mail client thats not Outlook you'd be able to notice the nested answer and who answers to who and the Reply-To field... which would make it easier to get a grip of what's occuring and avoid replying to the list.
But sadly with the all encompassing Outlook you have a flat view of all the mails with the same title and no (easy) way to see the Reply-To field ( or any other very important header stuff ).
At best, unless you spent days tinkering with the setup you can coax Outlook tino a not even semi decent nested threading, but that won't give you an easy access to all those header information that many old hands find important.
So people ended up thinking it was an Outlook group and just clicked on reply which used the Reply-To field to generate the To. So even if they didn't hit Reply All, their answers were received by all.