Limit the Number of Messages Per Connection

This option enables you to limit the number of messages sent in a single connection. It also provides a method for improving system performance by allowing the use of multiple connections to deliver messages. Once the set limit is reached, a new connection is automatically opened and the transmission continues until all messages are delivered.

For example, if you frequently send a large number of messages to certain remote servers, you can set the Limit number of messages per connection to value to a relatively small number, such as 20. As a result, when sending 100 messages in one session, SMTP will divide the messages into five groups of 20, and then open five connections to send them simultaneously. Message delivery, therefore, takes less time.

To limit the number of messages sent in one connection:

1. Start System Manager:
   On the Start menu, point to Programs, point to Microsoft Exchange, and then click System Manager.
2. Navigate to the SMTP virtual server.
   1. Servers
   2. Server
   3. Protocols
   4. SMTP
   5. SMTP virtual servers
   6. SMTP virtual server
3. Right-click the SMTP virtual server, and then click Properties.
4. On the Messages tab, select Limit number of messages per connection to, and then type a value in the box. The default is 20. The maximum is 150.