The mail system

: host sohumx1.sohu.com[61.135.132.110] said: 550
5.1.1 : Recipient address rejected: User unknown
in local recipient table (in reply to RCPT TO command)

: host 126mx01.mxmail.netease.com[220.181.15.140] said: 550
User not found: niudaquan@126.com (in reply to RCPT TO command)

: host 126mx01.mxmail.netease.com[220.181.15.140] said: 554
DT:SPM mx10, KMmowEBpdkbwiRdO_LVbAA--.1S2 1310165493
网易163免费邮--帮助中心
(in reply to end of DATA command)

: host 126mx01.mxmail.netease.com[220.181.15.140] said: 554
DT:SPM mx10, KMmowEBpdkbwiRdO_LVbAA--.1S2 1310165493
网易163免费邮--帮助中心
(in reply to end of DATA command)

: host mx1.daemonmail.net[216.104.161.4] said: 554 5.7.1
: Relay access denied (in reply to RCPT TO command)

: host sohumx1.sohu.com[61.135.132.110] said: 553 5.7.3
CONTENT REJECT:192.168.95.161.2011070906.XX7SiNbR:dspam
check:6:SOHU (in reply to end of DATA
command)

: host 163mx01.mxmail.netease.com[220.181.12.66] said: 554
DT:SPM mx16, QsCowJD7L+zxiRdOMRwtBg--.388S2 1310165497
网易163免费邮--帮助中心
(in reply to end of DATA command)

: host 163mx01.mxmail.netease.com[220.181.12.66] said: 554
DT:SPM mx16, QsCowJD7L+zxiRdOMRwtBg--.388S2 1310165497
网易163免费邮--帮助中心
(in reply to end of DATA command)
But I not send mail to this mail-address