收不到邮件请解决

以下是邮件发送者发给我邮件时, 收到的自动回复 .

From:  (Mail Delivery System)

Subject: Undelivered Mail Returned to Sender

Date: September 16, 2015 at 2:18:51 PM EDT

To: terri

This is the mail system at host
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

host mx2.mail.[110.75.48.150] refused to
   talk to me: 421 Downstream server error
Reporting-MTA: dns;
X-Postfix-Queue-ID: 5866B1D079D
X-Postfix-Sender: rfc822; terri
Arrival-Date: Wed, 16 Sep 2015 11:34:08 +0000 (UTC)

Final-Recipient: rfc822; yukipeng430
Original-Recipient: rfc822;yukipeng430
Action: failed
Status: 4.0.0
Remote-MTA: dns;
Diagnostic-Code: smtp; 421 Downstream server error


From: Terri Baynes <terri>

Subject: Fwd: Mack Molding payment resend

Date: September 16, 2015 at 7:33:59 AM EDT

To: yukipeng430 <yukipeng430>