By the way, did you have a chance to check how mail is delivered to job submitters?
We have tickets:
https://jira.toolserver.org/browse/TS-862 I don't receive SGE "job started/ended" mails anymore
and related (if not duplicated):
https://jira.toolserver.org/browse/TS-955 willow local MTA does not seem to accept mail from SGE jobs
There were some issues in configuring MTAs/SGE so that email works "just right", i.e. is delivered to the submitter (saper@submittedhost) and not to the localuser on the host running the task (saper@runninghost).
Another interesting issue (which probably can be solved only by software upgrade) is that attempt to submit a job from another job results in segmentation fault:
https://jira.toolserver.org/browse/TS-963 qsub segfaults when running from within SGE job
//Saper