[Serusers] help me about serweb

[jqkadl]

when I get my password on serweb , I couldn't receive mail.
I found nobody couldn't send mail in sendmail.

error in maillog :
Apr 7 16:08:43 localhost sendmail[3045]: j360fsxs003147:
to=<jqkadl at online.ln.cn>, ctladdr=<nobody at localhost.localdomain>
(99/500), delay=1+07:26:49, xdelay=00:00:01, mailer=esmtp, pri=660321,
relay=online.ln.cn. [202.96.74.67], dsn=4.0.0, stat=Deferred: 451 Mail
data invalid, ignored. The sender in mailbody is
"registrar at mydomain.org" while MAIL FROM is "nobody at localhost.localdomain"

very very thank u.