You can modify the delivery restrictions for users, such as the size of the sending and receiving messages and the restrictions to accept messages on the Exchange Server.
First , configure the delivery restrictions based on your requirement and then apply the same to users' mailboxes.
Select AD Mgmt tab - -> User Management - -> Delivery Restrictions ( present under Exchange Limits)
Click the Sending Message Size check box . Either use the "Default value" or manually enter the maximum size of Sending Message.
Click the Receiving Message Size check box . Either use the "Default value" or manually enter the maximum size of Receiving Message.
Click the Message Restrictions check box. Click the "From authenticated users only (Applies to Exchange 2003+)" if you want the users to receive message only from authenticated users.
Use one of the 3 check boxes to decide if the users will receive messages from "Everyone" or "Only From" or "From everyone Except".
Click the ADD button to add the members to the option selected in the previous step.
Select the domain and search the users. You can limit your search to specific OU's of the domain by clicking the Select OU link and selecting the OU's.
You can now use one of the following options to list the contacts whose group attributes have to be modified
a) You can import the CSV file (sample CSV file) which contains the list of users. After importing the CSV file, from the drop down menu (on the right hand side), select the attribute based on which you want to display the user objects.
b) Use the Search option to find the users (Note: To list all the users, just click the Search button without typing anything in the Search box)
9. Now, use the check box to select the desired list of user (s) and then click Apply
The change summary and the status of the modification can be verified.
Roll over the mouse over the icon to see the attributes in the windows native UI.