detecting & retrying after a 500 error result

I run a large webmail system and occasionally a process dies and returns
internal server errors. While this occurs only about 1/70,000 requests, it
does cause problems as one of the processes in the pool will always return
an internal server error. Is there a way that the process manager can be
modified to automatically restart any process that returns an internal
server error? How about retrying the request as well so the internal server
error is never seen by the user? Obviously I would like to find all the bugs
in the software, but a million lines of code and a very slim chance of a
problem means it's difficult to justify spending a lot of time on.

-Michael

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