If you change the configuration of any mailbox or remove the mailbox (by deleting the entry for the mailbox), you need not restart the Email Engine as the email daemon will automatically notice the change. By default, the email daemon checks for configuration changes every 30 minutes. To reduce the default time, you may add or modify the following entry in the EmailDaemon.properties file:
configChangeCheckInterval represents an integer value and is measured in minutes.
If you reduce the time, the email daemon will make more frequent calls to the AR System server.
If you are not making many changes to the configuration, you could wait for 30 minutes (the default time), or manually restart the entire Email Engine system.