Exchange Server Cookbook

5.24. Limiting the Number of Recipients to Which Messages Can Be Sent

Problem

You want to control the number of recipients to which a single message can be sent.

Solution

Using a graphical user interface

To set the maximum recipient count globally, do the following:

1. Open the Exchange System Manager (Exchange System Manager.msc).

2. Browse to the Global Settings object and expand the object.

3. Right-click Message Delivery and select Properties from the drop-down list.

4. Select the Defaults tab.

5. In the Recipient limits area, select Maximum (recipients) and enter 100 (or an appropriate value for your organization). Click Apply, and then click OK.

To set it on a per-server basis, do the following:

1. Open the Exchange System Manager (Exchange System Manager.msc).

2. Browse to the Server object (Administrative Groups → Administrative Group Name → Servers → Server Name) and expand the object.

3. Expand the Protocols object and double-click to expand the SMTP object.

4. Right-click Default SMTP Virtual Server and select Properties from the drop-down list.

5. Select the Messages tab.

6. Limit number of recipients per message to should be set to its default value of 64000. Change this to 100 (or an appropriate value for your organization). Click Apply, and then click OK.

7. Repeat this action for each SMTP virtual server or connector within your organization that you wish this setting to apply to.

Using a command-line interface

Save the following LDF file and run the command ldifde -i -f <filename>.ldf:

# ---------------- limit-recips.ldf ...