求助，信件被退回

qq37479055

This is the mail system at host mail.800im.net.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<jini@iactive.com.cn>: host iactive.com.cn[60.28.204.205] said: 550
    jhb@800im.net esmtp authentication failed and this mail server requires
    smtp authentication. (in reply to MAIL FROM command)

Reporting-MTA: dns; mail.800im.net
X-Postfix---by-extmail-org-Queue-ID: 98CEBA3D02
X-Postfix---by-extmail-org-Sender: rfc822; jhb@800im.net
Arrival-Date: Mon, 29 Oct 2007 21:30:46 +0800 (CST)

Final-Recipient: rfc822; jini@iactive.com.cn
Original-Recipient: rfc822;jini@iactive.com.cn
Action: failed
Status: 5.0.0
Remote-MTA: dns; iactive.com.cn
Diagnostic-Code: smtp; 550 jhb@800im.net esmtp authentication failed and this
    mail server requires smtp authentication.


求助啊。我发送和接收到126.com的邮件都是没有问题的，可是不知道为什么发送邮件到iactive.com.cn就不行呢

qq37479055

求助啊！