Tom was having trouble with outgoing emails. Some would come back with a message from the "mail administrator" about a server problem, a message Tom didn't understand. He had no other problems with his computer that day. And he couldn't tell from the message which server was at fault—his or the server on the receiving end.
So he decided to send an email to Bill, an old friend whose technological savvy was probably less than his. He wanted to see if Bill would receive the message and send a reply, confirming that someone, anyone, was getting his emails.
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