Follow a group
To receive a copy of messages sent to the group, follow the group in your inbox.
In Outlook on the web, select a group from the left navigation pane.
Select the group picture above the message list.
At the top of the group window, move the Follow in inbox toggle to On.
Receive a copy of email you send to a group
If you're a member of group and follow the group in your inbox, you can choose to receive a copy of messages you send to a group.
At the top of the page, select Settings
> View all Outlook settings.
Select Mail > Groups.
Select the check box for Send me a copy of email I send to a group.
Stop following a group
To stop receiving a copy of messages sent to the group, stop following the group.
Select a group from the left navigation pane.
Select the group picture above the message list.
At the top of the group window, move the Follow in inbox toggle to Off.