"420 TCP read error" Hatası Hk.

Merhaba,

Araştırdım ama net bir sonuca varamadım.Çok genel bir soru olacak ama "420 TCP read error" hatası neden kaynaklanır.Şirketimize mail gönderemeyen bir firmanın aldığı rapor aşağıdaki gibi.

Zaman ayırdığınız için teşekkür ederim.

Original Message-----
From: GWIAD04.GWIA04.GATEWAY
[mailto:[email protected]]
Sent: Monday, July 21, 2014 9:37 AM
To: [email protected]
Subject: Message Status - Undeliverable


The attached file had the following undeliverable recipient(s):


Information about your message:
    Message log tag: 2693724
    Number of send attempts: 99
    Time of initial send attempt: 07-17-14 08:12:47
    Time of last send attempt: 07-21-14 08:37:16

Transcript of session follows:
  Command:  EHLO mx1.heinenhopman.com
  Response: 420 TCP read error

Received: from Satellite (78.189.54.227.static.ttnet.com.tr
[78.189.54.227])
    by mx1.heinenhopman.com with ESMTP (NOT encrypted); Thu, 17 Jul
2014 08:12:35 +0200
From: =?iso-8859-9?Q?Ufuk_Er=E7elik?=
To: "'Muhammet GOKHAN'" ,
    "'muhammet gokhan'"
Cc: "'Oben NAKI'" ,
    "'Yavuz SARI'" ,
    "'Erkan Gungor'" ,
    "'Levent Arslan'"
Subject: FW: Ter.10 HVAC
Date: Thu, 17 Jul 2014 09:08:38 +0300
Message-ID:
<00d401cfa185$8db81ed0$a9285c70$@[email protected]>
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Muhammet Bey g=FCnayd=FDn,

=20

1987 m3/h fan Z-Drive i=E7in yeterli g=F6z=FCk=FCyor. Daha =F6nceki = hangi
tekne ile kar=FE=FDla=FEt=FDrd=FD=F0=FDn=FDzda kapasite de=F0eri d=FC=FE=FCk
= g=F6z=FCkt=FC size?

=20

=DDyi =E7al=FD=FEmalar,

=20


cid:DRJEBKCWSLDT.IMAGE_751.png

=20

Ufuk ER=C7EL=DDK

Project Department

=20

T:  +90 216 4938118

F:  +90 216 3924990

=20

Sahilyolu Cad. 119/A G=FCzelyal=FD/Pendik 34903 ISTANBUL - Turkey

=20

  = cid:HVDPPBAXSLAG.IMAGE_752.png

cid:GBMAEBPDEJBR.IMAGE_753.png