Mail Delivery Status Notification (Delay)

Mail Delivery Status Notification (Delay)

Hi there, 

I got such notification on several emails I sent out , to whom I got no issue in the past. could you help resolve this issue? 

his message was created automatically by mail delivery system.


THIS IS A WARNING MESSAGE ONLY.


YOU DO NOT NEED TO RESEND YOUR MESSAGE.



    ----- The following addresses had fatal errors -----    

   [Status: Error, Address: , ResponseCode 421, Host not reachable.]


Message will be retried for 4 more day(s)


    ----- Transcript of session follows -----    


Received:from [192.168.0.101] (58.20.20.42 [58.20.20.42]) by mx.zohomail.com

with SMTPS id 1477890514192833.5408154545818; Sun, 30 Oct 2016 22:08:34 -0700 (PDT)


User-Agent:Microsoft-MacOutlook/f.1b.0.161010

To:

Subject:FW: Car Inc and eHi Car Sample upto Jun 2016

Content-Type:multipart/mixed;

boundary="B_3560764113_1925080851"