Hi Peter and Ed,
Thanks for both of your replies. Peter, One question about the RPM, what exactly are the contents and what is the purpose? I'm trying to determine what is the cause of this problem also. The emails appear to be external in nature.
Ed, I have no idea what is causing this. From the text of the mail failure messages, it looks like someone was trying to route emails through my server, but I'm currently the only user on this server.
Thanks,
John Goodwin