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Exchange 2013: mails in log "inboundproxy@contoso.com"

Hi,

a customer was running SBS2008, which I migrated to Exchange 2013.  The old SBS was deinstalled, demoted and removed from the domain.  This was about two months ago.

Recently I installed a new firewall system (Sophos sg) with an SMTP proxy that receives and scans and forwards all mail.  I am finding in it's queue many messages going from NO SENDER to inboundproxy@contoso.com.

The log sais this:

HealthMailboxfed50d91c7c042958d086b53575e0dd3@internaldomain.local
The entered email address could not be verified. Check the email address of the recipient and try to send your message again.  Ask helpdesk if the problem persists.


Diagnose information for administrators:

generating server: mail.internaldomain.local

HealthMailboxfed50d91c7c042958d086b53575e0dd3@internaldomain.local
Remote Server returned '550 5.1.1 RESOLVER.ADR.RecipNotFound; not found'

Urspr√ľngliche Nachrichtenk√∂pfe:

Received: from mail.internaldomain.local (192.168.1.222) by mail.internalodmain.local
 (192.168.1.222) with Microsoft SMTP Server (TLS) id 15.0.1178.4; Thu, 29 Sep
 2016 09:06:12 +0200
Received: from InboundProxyProbe (127.0.0.1) by mail.internaldomain.local (127.0.0.1)
 with Microsoft SMTP Server id 15.0.1178.4 via Frontend Transport; Thu, 29 Sep
 2016 09:06:12 +0200
X-MS-Exchange-ActiveMonitoringProbeName: OnPremisesInboundProxy
X-Exchange-Probe-Drop-Message: FrontEnd-CAT-250
Subject: Inbound proxy probe
Message-ID: 
From: 
To: Undisclosed recipients:;
Return-Path: inboundproxy@contoso.com
Date: Thu, 29 Sep 2016 09:06:12 +0200
MIME-Version: 1.0
Content-Type: text/plain

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What is happening?
0
Ralph Scharping
Asked:
Ralph Scharping
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1 Solution
 
IvanSystem EngineerCommented:
Hi,

Exchange 2013 is using Health mailbox for health monitoring, and they are located in AD/Microsoft Exchange System Objects/ Monitoring mailboxes.

Do you have them in there? Maybe something went wrong with them, and they are deleted or something.

They can be recreated, but before doing that, maybe check to see if they do actually exist on your server.

Regards,
Ivan.
0
 
Ralph ScharpingDigital TherapistAuthor Commented:
Hi Ivan,  

I have the following arbitration mailboxes:

Arbitration mailboxes
0
 
IvanSystem EngineerCommented:
I taught on AD. Take a look at picture.
health.jpg
0
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Ralph ScharpingDigital TherapistAuthor Commented:
Yes, I have that.  Looks just like that, only that it's 14, not 12 entries.
0
 
IvanSystem EngineerCommented:
Hi,

I found article below, with explanation of "problem". As it seams this is "some what normal" and there is no special solution to it.

Take a look: http://exchangeserverpro.com/exchange-server-2013-inboundproxy-com-ndr/

Maybe someone else, has some addition info on it...

Regards,
Ivan.
0
 
Ralph ScharpingDigital TherapistAuthor Commented:
Thanks.  Strange, though.
0

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