This section explains how to allow users to send email as a Group in the Exchange admin center (EAC) in Exchange Online.
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In the Exchange admin center, go to Recipients > Groups.
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Select Edit
on Group that you want to allow users to send as. -
Select group delegation.
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In the Send As section, select the + sign to add the users that you want to send as the Group.
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Type to search or pick a user from the list. Select OK and Save.
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