This attribute only appears in the output of the SHOW_ALL_ATTRIBUTES command if you have explicitly assigned a value to it using the
SET_ATTRIBUTE command. The default setting is not displayed.
When the UNPROCESSED_DL_POST_LIMIT value is exceeded, the Deadline Manager stops sending deadline messages until the number of deadline messages in the Mbox queue drops below the value that is currently set for this process attribute.
If both the UNPROCESSED_DL_POST_LIMIT and
MAX_AGE_BEFORE_RESETPOST are reached at the same time, then all the deadline messages are resent.