Using classic Outlook for Windows in business environments
Hi @Anonymous ,
As I know, it is normal that you will receive the emails you sent to the Distribution groups (which you are a member of them) and seems it is by design, we could not make changes to it.
Besides, if you really do not want receive these duplicate emails, as a workaround, it is suggested for you to create an Outlook rule to delete them automatically. For more information, please check the steps mentioned in this similar thread.(Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.)
Hope this can be useful.
If an Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.