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I can't receive email from outside my internal network!!!

I am running an SBS 2008 server with Exchange 2007 configured and up until today at 9:24am - it was working properly.  This server was installed brand new from Dell with a fresh install of Windows SBS 2k8 in June of this year (2010).  I am an independent consultant and I rarely have to check on this client.  I cannot think of anything that would have happened to make this server stop routing email messages to their inboxes.  Lemme give some info (and I hope I don't forget anything!)

1. All MX records are set up and have been working properly as of June 2010
2. I am the only admin and I have not changed anything on this server.
3. Windows updates are not set to install automatically.
4. I can send from any user account on my internal network to several different emails outside of the internal network and these emails are received to my external recipients.
5. When I send email to an internal recipient from an external email, I do NOT receive an NDR message and it appears that the email is delivered successfully due to the fact that I can't tell otherwise because there is no return email of delay or non-delivery.
6. I can think of no changes made to the server that might cause this.  Obviously something is going on, but I can't think of anything that I or any internal user might have done to cause this.  
7. I am the only user to log into the server and access it.
8. This is small office of only 6 user accounts.
9. I CAN send email from an internal user A account to an internal user B account using the uname@domain.local email address and my user B receives the email from user A, and vise-versa.  (Email can be sent internally).
10. ?!?!?!?!?!?!?!?!?

Please give me some direction!  I have scoured the Internet and all problems that have been solved are not issues that I can correlate to my problem!


Chris in San Antonio
1 Solution
I would make sure all exchange services are running and even if they are running do a restart of all services, also check internet connectivity from server to make sure you can access an external website preferably one that hasnt been visited before as the history may load a saved copy.
You should check to your network firewalls and make sure there all the necessory ports are open. You will also need to reconfigure your connectors and run Test-MailFlow command from exchange management shell. After this run mail flow troubleshooter from tools of the exchange management console. and post the results.
chrisdoddsAuthor Commented:
Server has just been powered down and rebooted within the last half hour so all services were restarted.  I have checked and all Exchange services appear to be running properly. I can access the Internet from this server and I can access this server from a remote machine using RDC - the server is available online.  I have checked network firewalls and nothing has changed - all proper ports are open. I can Telnet from an outside machine into my Exchange Server over port 25. (Not exactly sure what to do from there...)

Reconfigure my connectors?  What do you mean by this?

Test-MailFlow command yields:


[PS] C:\Windows\System32>test-mailflow

TestMailflowResult         MessageLatencyTime                      IsRemoteTest
------------------         ------------------                      ------------
Success                    00:00:02.2231997                               False

[PS] C:\Windows\System32>


Mail Flow Troubleshooter: yields these two errors...

Area: Basic Server Information  
Server: ARBK-2K8  
  IPv6 Protocol Not Supported Server: ARBK-2K8
 Exchange Server is not capable of supporting Internet Protocol Version 6 (IPv6) addresses on server ARBK-2K8. The IPv6 link-local address 'fe80::25ee:60d3:e099:9c11' was found on the adapter '[00000006] Broadcom BCM5716C NetXtreme II GigE (NDIS VBD Client)'.
  Network Adapter IPv6 Address Not Supported Server: ARBK-2K8
 Exchange Server is not capable of supporting Internet Protocol Version 6 (IPv6) addresses on server ARBK-2K8. An IPv6 address was found on adapter '[00000006] Broadcom BCM5716C NetXtreme II GigE (NDIS VBD Client)'.
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chrisdoddsAuthor Commented:

Area: Mail Acceptance  
Server: ARBK-2K8  
  Error submitting mail Server: ARBK-2K8
 Mail submission failed: Error message: Insufficient system storage. The server response was: 4.3.1 Insufficient system resources.
  Error submitting mail Server: ARBK-2K8
 Mail submission failed: Error message: Server does not support secure connections..
  Error submitting mail Server: ARBK-2K8
 Mail submission failed: Error message: Insufficient system storage. The server response was: 4.3.1 Insufficient system resources.
chrisdoddsAuthor Commented:
Figured it out...

My C: drive was 97% full and with only a tiny amount of space left available, Exchange stopped delivering emails to user inboxes.  I'm not sure where the threshold is, but by tracking down where my largest directories were, I was able to find this directory --


and remove it's contents to free up nearly 10Gb of space on my C: (of logs generated and kept since the install in June.)  My task is now to figure out why these logfiles are being generated and how to make them circular 9if that's possible).  Thanks for your help!

DarinTCHSenior CyberSecurity EngineerCommented:
set the logs to overwite themselves after say 30 days

also look at echange message tracking and exchange error logs
you probably would have seen the disk space error

sometimes a small exchange or  server will track HD and email you at 5%
chrisdoddsAuthor Commented:
With many hours and lots of patience (and cursing), I figured it out.  
It was possibly related to back pressure from the Exchange server.

Jeff SCommented:
Port 25 is open and I can connect through it. I ran test suggested above and got this:

Testing inbound SMTP mail flow for domain kdenbow@sbstechservice.com.
  ExRCA failed to test inbound SMTP mail flow.
   Test Steps
   Attempting to retrieve DNS MX records for domain sbstechservice.com.
  One or more MX records were successfully retrieved from DNS.
   Additional Details
  MX Records Host esva.sbstechservice.com, Preference 0
 Testing Mail Exchanger esva.sbstechservice.com.
  One or more SMTP tests failed for this Mail Exchanger.
   Test Steps
   Attempting to resolve the host name esva.sbstechservice.com in DNS.
  The host name resolved successfully.
   Additional Details
  IP addresses returned:
 Testing TCP port 25 on host esva.sbstechservice.com to ensure it's listening and open.
  The port was opened successfully.
   Additional Details
  Banner received: 220 *******************
 Attempting to send a test e-mail message to kdenbow@sbstechservice.com using MX esva.sbstechservice.com.
  Delivery of the test message failed.
   Additional Details
  The server returned status code 452 - Insufficient system storage. The server response was: 4.3.1 Insufficient system storage
Exception details:
Message: Insufficient system storage. The server response was: 4.3.1 Insufficient system storage
Type: System.Net.Mail.SmtpException
Stack trace:
at System.Net.Mail.MailCommand.CheckResponse(SmtpStatusCode statusCode, String response)
at System.Net.Mail.MailCommand.Send(SmtpConnection conn, Byte[] command, String from)
at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException& exception)
at System.Net.Mail.SmtpClient.Send(MailMessage message)
at Microsoft.Exchange.Tools.ExRca.Tests.SmtpMessageTest.PerformTestReally()
 However, I have 25.1GB of free space available so I am not sure how there could be insufficient space.

I should also add I am a bit of a newb when it comes to Exchange Mail Admin...
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