In order to allow a mailbox user to send as another user (oposed to sending on behalf of a user) we should change the extended rights of the user or distribution groups AD object as follows:
Add-ADPermissions -Identity <Distribution Group> -User <User\Security Group> -ExtendedRights Send-As
In order to apply changes immideialy you should restart the information store service:
sc stop MSExchangeIS && sc start MSExchangeIS
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