Can receive mail,but can't send email!!!

[fhawk]

The log like:
Mar 11 14:28:41 isp postfix/qmgr[4449]: 4CCDF773884E: to=<121377924@qq.com>, relay=none, delay=241834, delays=241832/2.8/0/0, dsn=4.3.0, status=deferred (unknown mail transport error)
Mar 11 14:28:42 isp postfix/qmgr[4449]: 4358977388AF: to=<121377924@qq.com>, relay=none, delay=166813, delays=166810/3.1/0/0, dsn=4.3.0, status=deferred (unknown mail transport error)
Mar 11 14:28:42 isp postfix/qmgr[4449]: 493E17738802: to=<121377924@qq.com>, relay=none, delay=251067, delays=251064/3.2/0/0, dsn=4.3.0, status=deferred (unknown mail transport error)
Mar 11 14:28:42 isp postfix/qmgr[4449]: 43CAF77388A0: to=<121377924@qq.com>, relay=none, delay=234362, delays=234359/3.3/0/0, dsn=4.3.0, status=deferred (unknown mail transport error)
Mar 11 14:28:42 isp postfix/qmgr[4449]: 481C777387F9: to=<121377924@qq.com>, relay=none, delay=255090, delays=255087/3.4/0/0, dsn=4.3.0, status=deferred (unknown mail transport error)
Mar 11 14:28:42 isp postfix/qmgr[4449]: 42E6E7738858: to=<121377924@qq.com>, relay=none, delay=241609, delays=241606/3.5/0/0, dsn=4.3.0, status=deferred (unknown mail transport error)
Mar 11 14:28:42 isp postfix/qmgr[4449]: BFB917738787: to=<121377924@qq.com>, relay=none, delay=16137, delays=16133/3.7/0/0, dsn=4.3.0, status=deferred (unknown mail transport error)
Mar 11 14:28:42 isp postfix/qmgr[4449]: 6317F77388E8: to=<121377924@qq.com>, relay=none, delay=76948, delays=76945/3.8/0/0, dsn=4.3.0, status=deferred (unknown mail transport error)
Mar 11 14:28:42 isp postfix/qmgr[4449]: 057C077388AE: to=<174325455@qq.com>, relay=none, delay=166814, delays=166810/3.9/0/0, dsn=4.3.0, status=deferred (unknown mail transport error)

[BeNe]

Please take a look at this site, post logs and more info!
-> http://www.isp-control.net/documentation...l_problems

Greez BeNe

[fhawk]

I disabled chroot in master.cf!!
That's OK!!
Thanks!!