The error message I get is...
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator and inform them of the time the error occurred, and anything that you might have done that may have caused the error.
More information about this error may be available in the server error log.
I call my hosting provider however they do not see anything on their end, and are no help to me.
I've tried a small sample set of 3 emails, all my own, and it works just fine.
I've double checked my database to make sure that the structure of that database is the same as my sample.