Killing the job should do the trick
Do a "ps -ef |grep iw" on the server and see what all processes are running. Find the process that is owned by the user who started the workflow. Once you have identified that... do a kill -9 where process id is the Id of the processJust take care that killing the wrong process can result in some other job or task getting terminated, so be absolutely sure before doing a kill
... command => "$iwperl $email_ipl",...
you can move to next task by using this$iw-home/bin/iwcallback 0provide taskid and 0 or 1 depending on the successers