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Exchange 2010 - unreachable for too long

Posted on 2013-11-21
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Last Modified: 2013-11-24
Hey Guys

I'm getting a weird issue with email coming from yahoo.com.au
Sporadically email from yahoo.com.au will not arrive and the sender will get a bounce email with "unreachable for too long" in the error information.

The yahoo.com.au sender will add cc addresses to the email and it will arrive at the other recipient but not at a recipient at my Exchange server. But it's not consistently always happening.

I created a test yahoo.com.au email account and sent tests through and they came in.

I have added any yahoo.com.au IP address to the allow list in Forefront and Exchange antispam.

Do you guys think it's my Exchange server?

Kind Regards
Aaron
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Question by:moncomp
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by:Sean
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No it does not sound like its your exchange server. Sounds like a problem from Yahoo or something wrong with a route between you and their server. Nothing you can do about it unfortunately.
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by:Lafzo
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It may be a routing issue outside of your network.
Providers like yahoo have several servers + routes used for mail.
It's possible that there was some routing issue (OPSF) which they should be able to adjust later on. Sometimes it takes longer than usual as they will have to pin point the break in the path.

Out of curiosity, does this user get the same issue if they downloaded their yahoo unto a third party application (outlook) and then tried to send to your company?

Thanks
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by:moncomp
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Hey thx for your feedback.  I had a bounce yesterday and on a whim checked the exchanges accepted domain registra. They had a routing issue throughout the day.  Is it possible that caused it, though emails other than yahoo came in?
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by:Sean
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If you get a bounce back post the text at the bottom as it can help figure out what the cause of the bounce was.
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by:moncomp
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-------- Original Message --------Subject: Failure NoticeFrom: MAILER-DAEMON@yahoo.comTo: xxxx@yahoo.com.auCC: Sorry, we were unable to deliver your message to the following address. <xxx@abc.com>:Mail server  or "abc.com"unreachable for too long --- Below this  line is a copy of the message. Received: from [98.138.226.178] bynm15.bullet.mail.ne1.yahoo.com with NNFMP; 19 Nov 2013 21:32:57 -0000Received: from [98.138.89.173] bytm13.bullet.mail.ne1.yahoo.com with NNFMP; 19 Nov 2013 21:32:56 -0000Received: from [127.0.0.1] byomp1029.mail.ne1.yahoo.com with NNFMP; 19 Nov 2013 21:32:56 -0000X-Yahoo-Newman-Property: ymail-3 
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by:Sean
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yes it sounds like an issue with their server or some routing in between.
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by:moncomp
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Ok cool, I was worried forefront was blocking email and not telling me
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Sean earned 500 total points
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No if that happen it would show it in the NDR and it would be pretty clear if you know what to look for. Basically this shows nothing about your servers so it has nothing to do with you.
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by:moncomp
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thanx guys, i let the user know that it's yahoo's end or somewhere in-between :)
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