Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

Some messages from a specific domain are never received by our Exchange 2010 server.  No NDR on sending server.

Posted on 2014-01-20
11
373 Views
Last Modified: 2014-01-21
The issue appears to be completely intermittent.  Some emails get through, some dont.  The disappearing messages contain attachments at times, and no attachment other times.  It appears that 'most of the time' the messages ARE received.  The fact that no NDR is received by sender makes it impossible for either party to know the email didn't go through.  This is causing a huge communication bottleneck during important projects.
0
Comment
Question by:raduk
  • 5
  • 3
  • 3
11 Comments
 
LVL 20

Expert Comment

by:Patrick Bogers
ID: 39795090
Hi

Open ESM -> Toolbox-> Message tracking center and try to discover what exchange does with it. It should give you a clue.
0
 
LVL 15

Expert Comment

by:jrhelgeson
ID: 39795095
What anti-spam vendor are you using?  If it is randomly flagging/dropping messages as spam you will not get any NDR's.
0
 
LVL 1

Author Comment

by:raduk
ID: 39795104
Patrick,

The delivery reports do not show the messages ever touching our server.  I can see the messages in delivery reports when they are received successfully, they aren' there when we have the 'vanishing emails'
0
Back Up Your Microsoft Windows Server®

Back up all your Microsoft Windows Server – on-premises, in remote locations, in private and hybrid clouds. Your entire Windows Server will be backed up in one easy step with patented, block-level disk imaging. We achieve RTOs (recovery time objectives) as low as 15 seconds.

 
LVL 1

Author Comment

by:raduk
ID: 39795109
jrhelgeson,

Our ISP provides spam filtering using barracuda servers.  They then pass on the messages to us.  I find it odd that some messages would get through the barracuda filtering and other dont.  And the issue only appears to be with 1 particular domain.
0
 
LVL 15

Accepted Solution

by:
jrhelgeson earned 300 total points
ID: 39795112
It's got to be the SPAM filter then.  Either your filter for incoming mail, or the senders filter for outgoing mail is cutting & silently dropping the message.
0
 
LVL 20

Expert Comment

by:Patrick Bogers
ID: 39795114
Then it is possible a anti-spam software/hardware solution is doing the filtering/dropping for it reaches exchange. Is there something like GFI spam filtering installed on that box?
0
 
LVL 1

Author Comment

by:raduk
ID: 39795169
Patrick,

The only spam filtering we have is at the barracuda servers at the ISP.


jrhelgeson,

The ISP tends to not like taking responsibility for things.  I will contact them and see if they will 1. admit its their problem and 2. fix the issue.
0
 
LVL 1

Author Comment

by:raduk
ID: 39795172
Any suggestions as to what to tell the barracuda admins so they cant point the finger back at me?  Should I be checking smtp or receive connector logs in addition to the delivery reports in message tracking section of ESM?
0
 
LVL 20

Assisted Solution

by:Patrick Bogers
Patrick Bogers earned 200 total points
ID: 39795176
If you buy barracuda services from your ISP they should be able to whitelist that one problematic domain. Before you call the barracuda team make sure you have some solid info about the mail that is suspected being dropped. Info like:

What is the emailadress of the sender
When excactly was the mail send.
What is the subject for the mail
What is the emailadress of the reciever

With this info they can filter very fast.
0
 
LVL 15

Expert Comment

by:jrhelgeson
ID: 39795571
Spam filters keep logs of all messages they deliver, and all messages they drop. Ask the ISP to provide you a transaction report for your specific source/dest information.  Have them check the quarantine.
0
 
LVL 1

Author Comment

by:raduk
ID: 39797830
Turns out that the sending organization was using an email service that utilized multiple email servers.  2 of those email servers have been on blacklists for the past 6 months or so.  The barracuda server at our ISP was silently dropping emails coming from the blacklisted servers.  This explains why the problem was intermittent.  

You both were very helpful.  Thanks for your help.  I will split up the points between the two of you.
0

Featured Post

Complete VMware vSphere® ESX(i) & Hyper-V Backup

Capture your entire system, including the host, with patented disk imaging integrated with VMware VADP / Microsoft VSS and RCT. RTOs is as low as 15 seconds with Acronis Active Restore™. You can enjoy unlimited P2V/V2V migrations from any source (even from a different hypervisor)

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Access to GAL from one domain to another 6 35
SPF, EXCHANGE 1 31
Search not working in Outlook 2016 7 240
How to enable disabled mailbox in Exchange 2010 3 17
This process describes the steps required to Import and Export data from and to .pst files using Exchange 2010. We can use these steps to export data from a user to a .pst file, import data back to the same or a different user, or even import data t…
Scam emails are a huge burden for many businesses. Spotting one is not always easy. Follow our tips to identify if an email you receive is a scam.
In this video we show how to create an Accepted Domain in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Mail Flow >> Ac…
Nobody understands Phishing better than an anti-spam company. That’s why we are providing Phishing Awareness Training to our customers. According to a report by Verizon, only 3% of targeted users report malicious emails to management. With compan…

789 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question