re [1]: e-mails

I get the feeling this is something well-known, but I'm not really sure.

What are the e-mails with titles re [1]: or re [15]: from? They're coming from a few names, with addresses of random characters at yahoo and hotmail. My mom complained about getting them on her cellphone, and now I'm getting some in my (e-mail) Inbox.

Is this some sort of virus? And if so, any idea how it spreads? You can e-mail our phones (it gets sent as a text message), but no one we know has ever done it, so it's unlikely it's pulling it from someone's address book.

 

 

 

 

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