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Durai PandiDurai Pandi 

Salesforce email not received by group email address.

The group <group name> only accepts messages from people in its organization or on its allowed sender's list, and your email address isn't on the list.

How to whitelist the sender in the group? As office 365 group UI accepts email ID.
We got the bounce email while sending mass email through code. Can anyone shed light on this?
Rahul KumarRahul Kumar (Salesforce Developers) 
Hi Durai,
May I suggest you please refer the below link for reference. Hope it will help.
Please mark it as best answer if the information is informative.

Thanks
Rahul Kumar