Server Errors don't usually mean the entire server is narfed and it's very name is misleading a bit. Server Error 500 refers to a program that didn't complete thus never sending the Content-type code to the server. This can be from any number of things, from text sent (by an outside program (if it errors)) before the headers, to a program that crashed in mid stream for some reason. Server Errors strangely enough are very rarely the result of the server itself, and even then is only the web server, not the email server. Can't say why that bounced, maybe cause they had taken it down as well to reboot...

ShadowWind

Been fighting server errors for a good number of years now...