Two possibilities:

來源: arening 於 2004-03-10 21:17:48 [] [舊帖] [給我悄悄話] 閱讀數 : (342 bytes)
回答: That's spammer's little trick! 由 Submariner 於 2004-03-10 15:33:48

1. the spammers hijack your email identitiy so will not be tracked down by the mail server they tried to attack.

2. the spammers attached virus so that the message may attack both the target server and yourself (because the rejected message will be sent back to YOU). So be careful never open any attachment in such returned messages.

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