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<*******@nifty.ne.jp >: host mf.nifty.ne.jp[***.***.***.***] said: 550 5.1.1 <*******@nifty.ne.jp >… User unknown (in reply to RCPT TO command)
さくらインターネットは
The original message was received at Fri, 10 Sep 2010 09:10:44 +0900 (JST) from ***.ne.jp [***.***.***.***]
—– The following addresses had permanent fatal errors —– <*****@nifty.ne.jp > (reason: 550 5.1.1 <*****@nifty.ne.jp >… User unknown)
—– Transcript of session follows —– … while talking to mf.nifty.ne.jp.: >>> DATA <<< 550 5.1.1 <*****@nifty.ne.jp >… User unknown 550 5.1.1 <*****@nifty.ne.jp >… User unknown <<< 503 5.0.0 Need RCPT (recipient)