Check if messages are present in the MTA message queue directory, typically msg-svr-base/data/queue/. Use command-line utilities like imsimta qm to check for the presence of expected message files under the MTA message queue directory. For more information on imsimta qm, refer to the MTA command-line utilities chapter in theimsimta qm in Sun Java System Messaging Server 6.3 Administration Reference and 27.8.6 imsimta qm counters
If the imsimta test -rewrite output looks correct, check that messages are actually being placed in the MTA message queue subdirectories. To do so, enable message logging (For more information on MTA logging, see 25.3 Managing MTA Message and Connection Logs in the directory /msg-svr-base/log/. You can track a specific message by its message ID to ensure that it is being placed in the MTA message queue subdirectories. If you are unable to find the message, you may have a problem with file disk space or directory permissions.