The basic idea is, a crook will spam thousands of addresses in hope that someone left town and set "Out Of Office" emails. If they get Auto-Responses then the crook(s) will know that you're out of town, and your house is most likely empty...

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I Hope i'm not reposting (if so- i'll delete this thread)- i looked...

Think twice before you set up an automated "out of office" email message. According to this article from NetworkNews (UK), inspired criminals are using these "on vacation" notifications to pinpoint empty homes and businesses and burglarize them. And we just thought they were annoying!
1.) Keep "out of office" emails bland and generic
2.) Redirect to another colleague
3.) Don't give your job title
4.) Don't say you're on vacation, or certainly for how long
5.) Don't include personal contact info