Sun Java System Messaging Server 6.3 Administration Guide To Monitor the Rate of Delivery Failure

Delivery failures are recorded in the MTA logs with the logging entry code Q. Look at the record in the file msg-svr-base/data/log/mail.log_current. Example:

mail.log:06-Oct-2003 00:24:03.66 501d.0b.9 ims-ms Q 5 durai.balusamy@Sun.COM rfc822;durai.balusamy@Sun.COM durai@ims-ms-daemon <00ce01c38bda$c7e2b240$6501a8c0@guindy> Mailbox is busy