[Systems] unhappy mailman when I moderate a message, returns 500 error this past week (nut apparently processes request anyway)

[Sean DALY]

Internal Server Error

The server encountered an internal error or misconfiguration and was
unable to complete your request.

Please contact the server administrator, [no address given] and inform
them of the time the error occurred, and anything you might have done
that may have caused the error.

More information about this error may be available in the server error log.