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http://en.wikipedia.org/wiki/Joe_job
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2008-06-24 13:22:26 no host name found for IP address 58.248.7.24
2008-06-24 13:22:27 H=(yahoo.com.cn) [58.248.7.24] Warning: Sender rate 4.1 / 1h
2008-06-24 13:22:28 H=(yahoo.com.cn) [58.248.7.24] F=<lkjww11@yahoo.com.cn> rejected RCPT <info@xxxxx.com>: (yahoo.com.cn) [58.248.7.24] is currently not permitted to relay through this server. Perhaps you have not logged into the pop/imap server in the last 30 minutes or do not have SMTP Authentication turned on in your email client.