System Administrator message
Several times in the last few weeks I have suddenly received an email headed System Administrator message unavailable. It says: "This message is no longer available on the server." On one occasion I was online with my ISP support when this message came in direct to my email client, and then as we watched, five minutes later it appeared on the ISP server. I am concerned about what or who originated the message, as it did not come from the ISP. Could it indicate a hacker has got access to my system? Can anyone suggest?