The delivery restrictions you set in Message Delivery
Properties apply to all
You can set the following delivery restrictions:
As with message size limits, any per-user settings made at the mailbox level will override the default global limit of 5,000. If a user's mailbox is set to limit recipients to 2,500, and a message is sent to your organization with 4,000 recipients, everyone in your organization will be allowed to receive that message except for the user with the limit of 2,500. If no per-user limit is imposed, athe mailbox will default to the global setting.
Related Topics
Working with Default Settings