This article explains how to use a distribution list in Outlook to send the same email to a group of recipients. Instructions apply to Outlook 2019, 2016, 2013, 2010, and 2007, and to Outlook for Microsoft 365.
How to Create a Contact Group/Distribution List in Outlook by Chris Menard
To send the same email to an entire distribution list in Outlook:
Create a new email message in Outlook. Go to the Home tab and select New Email.
Mark the distribution list.
