emails bouncing with Mail server for "domainname.com" unreachable for too long

Hello, I have a user who has been receiving intermittent messages when sending from a yahoo account to what looks like various corp domain accounts. This user only has access to the yahoo account so if its anything on the remote end not much can be done. I've seen other posts on this but honestly not one I've seen provides any clarity on what might be causing it.

In some of the bounces the message goes to multiple people and only bounces on one, on some its just sent to one person and that bounces. The message is below.

Does anyone have any insight into if this is a yahoo issue, a user issue (virus, config), an internet issue or something on the bounce users email?

Sorry, we were unable to deliver your message to the following address.

<bounceuser@domainname.com>:
Mail server for "domainname.com" unreachable for too long :

--- Below this line is a copy of the message.

Received: from [98.138.101.132] by nm23.bullet.mail.ne1.yahoo.com with NNFMP; 13 Sep 2014 15:07:02 -0000
Received: from [98.138.226.61] by tm20.bullet.mail.ne1.yahoo.com with NNFMP; 13 Sep 2014 15:07:02 -0000
Received: from [127.0.0.1] by smtp212.mail.ne1.yahoo.com with NNFMP; 13 Sep 2014 15:07:02 -0000
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1410620822; bh=DaoUNqv4Qd4h4+PFt2lWBDRId3tDYtkBDZYk+EBJ/3E=; h=X-Yahoo-Newman-Id:X-Yahoo-Newman-Property:X-YMail-OSG:X-Yahoo-SMTP:From:To:Subject:Date:Message-ID:MIME-Version:Content-Type:X-Mailer:Thread-Index:Content-Language; b=1QN0Ph75N8acbMxh7kmkMu49baDAZ224PnEpqkDi4ceWXMAJFy2k+ZFgcWtBN5ps4MA3RAQRJok0DaLLsFW72/cFf4iM/K9KMvDK+yU73PH6AK2arqh++1KQeSYk6/BmvC0yxVNoGBkSgcpMs2QEAlipw9KNTbi/1rbCBg+z92c=
X-Yahoo-Newman-Id: 61122.35641.bm@smtp212.mail.ne1.yahoo.com
X-Yahoo-Newman-Property: ymail-3
X-YMail-OSG: n.vQPLwVM1myrXgjffjLf22xHjoKgB4Sf2FHyYFDkZmbd4b
.lPSUdoXQewzM9gq3UaVjVT5hM9Na2RmSmhxF9XzIgzhog5wMmI6edf2ZwLv
EutowOjNDtRntpI0DGs6R038Rt5m_wMFIjSfeaRb57ZNfF9NhwZSec.ZXB0B
IXTDiJcVVv2elKxig6QlxuzNn7Jr8eh5oNtXNyGqySe2Bc2_2T2jRybUjzOv
OTkwc1aPaXJLg4Z_hd6ZyTONkxuwVzf9rajashVZaV9awifdsiuEVi.mSMap
QgAhnNSOIvWkh0a91Qig8JeysNjsJ24_k3JFDgQszI9zVJc1JgWFLLD.fhGp
92pE7G47M6bWP42gDEykWJVje8h4WXaLq4QPWUDzu1mQLmsURH86t8HSWlYr
_mteoLTD9TYZILvrTA8.wMjvbOlAy0MreOD0HdDMD6W6cjE98M3FIdf7GQ16
HyRBpILUnvtCm.JZbykKJpXwV6cPUfLARfTEKFf8SGympHE.9BA37D_ufT76
rqqjWRpuPEg6jXFR858ik8orfVhOY
X-Yahoo-SMTP: Qhg73xuswBBv3qt_yEg9ig9Qjt_5RmA-
From: "Sending User" <SendingUser@yahoo.com>
To: <reciepient1@domain1.com>,
   <recipient2@domain2.com>,
   <bounceuser@domainname.com>,
   <reciepient3@domainname3.com>,
   <reciepient4@domainname4.com>,
   Subject: subjectline
Date: Sat, 13 Sep 2014 10:06:57 -0500
Message-ID: <00d201cfcf64$5dc53c00$194fb400$@yahoo.com>
MIME-Version: 1.0
Content-Type: multipart/mixed;
   boundary="----=_NextPart_000_00D3_01CFCF3A.74F17DF0"
X-Mailer: Microsoft Outlook 14.0
Thread-Index: Ac/PYZONqqKpNkySQlGxj3lhkhs2GQ==
Content-Language: en-us

This is a multipart message in MIME format.

------=_NextPart_000_00D3_01CFCF3A.74F17DF0
Content-Type: multipart/alternative;
   boundary="----=_NextPart_001_00D4_01CFCF3A.74F17DF0"


------=_NextPart_001_00D4_01CFCF3A.74F17DF0
Content-Type: text/plain;
   charset="us-ascii"
Content-Transfer-Encoding: 7bit
LVL 2
ChiITAsked:
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Larry Struckmeyer MVPCommented:
See if you can send a test message to that user.  Or see if you can ping that mail server by name.  The ping may not reply, but it should give you an IP if it is a valid smtp mail server.

ping mail.domain-name.com

or use a tool such as mxtoolbox.com to test it, or try to telnet to it on port 25.
telnet mail.domain-name.com 25  or if you have determined a valid IP address try telnet ip address 25.
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ChiITAuthor Commented:
I haven't done that but I'm sure its valid. In one case the user received the email after sending a second time, later on.  Its also multiple users on multiple domains, separate emails....
0
ChiITAuthor Commented:
this problem fixed itself, I'm guessing it was a yahoo server issue....
0

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ChiITAuthor Commented:
problem resolved itself.
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