ResponseCode 421, Host not reachable
I can not send mail addressed to a specific domain.
The domain I tried to send is @ gkt.jp.
The following error message will be returned.
-----------------------------------------------------------------------------------------
This message was created automatically by mail delivery system.
THIS IS A WARNING MESSAGE ONLY.
YOU DO NOT NEED TO RESEND YOUR MESSAGE.
The original message was received at Wed, 22 Feb 2017 07:07:36 -0800
from cyj0----3＠zoho.com [
cyj0----3@zoho.com]
----- The following addresses had fatal errors -----
[Status: Error, Address: <
ml-im-smc@gkt.jp>, ResponseCode 421, Host not reachable.]
Message will be retried for 4 more day(s)
----- Transcript of session follows -----
Received:from mail-vk0-f52.google.com (mail-vk0-f52.google.com [209.85.213.52]) by mx.zohomail.com
with SMTPS id 1487773329463299.1260342645164; Wed, 22 Feb 2017 06:22:09 -0800 (PST)
Message-ID:<CAH3ZC0HoCt6cG8H4S=
iz7pBYNRvwBKviav_DX6BgHgAd6q6q6A@mail.gmail.com>
Date:Wed, 22 Feb 2017 23:21:38 +0900
-------------------------------------------------------------------------------------------------------
This message was created automatically by mail delivery system.
THIS IS A WARNING MESSAGE ONLY.
YOU DO NOT NEED TO RESEND YOUR MESSAGE.
The original message was received at Wed, 22 Feb 2017 06:42:02 -0800
from
cyj0----3@zoho.com [
cyj0---3@zoho.com]
----- The following addresses had fatal errors -----
[Status: Error, Address: <
ml-im-smc@gkt.jp>, ResponseCode 421, Host not reachable.]
Message will be retried for 4 more day(s)
----- Transcript of session follows -----
Received:from mail.zoho.com by mx.zohomail.com
with SMTP id 1487771796178988.4707895122003; Wed, 22 Feb 2017 05:56:36 -0800 (PST)
Message-ID:<
15a661c02cb.dafb70d7312.6583563917166719245@zoho.com>
Date:Wed, 22 Feb 2017 22:56:36 +0900