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(a)online.ln.cn>cn>, ctladdr=<nobody(a)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(a)mydomain.org" while MAIL FROM is "nobody(a)localhost.localdomain" very very thank u.