Duplicate email with nested groups

Hello,

We have an organization which has hundreds of nested groups. Domino is used as a mail transport, not for applications in this environment.

We have a situation in which users receive 10 to 15 copies of an email message if an email is sent to a top level group. This is because the end user may be included in 10 to 15 nested groups which are within the top level group.

Is there any way to avoid receiving multiple copies of each email message?

Removing them from each nested group is not an option.

Regards.