Undeliverable Mail Messages..

I am running Exchange Server as part of Small Business Server 2003 and have started getting email messages saying...

"Your message did not reach some or all of the intended recipients.

      Subject:      hi Lesley.
      Sent:      05/11/2006 03:06

The following recipient(s) could not be reached:

      iamjustsendingthisleter@MY_DOMAIN.COM on 05/11/2006 06:56
            A configuration error in the e-mail system caused the message to bounce between two servers or to be forwarded between two recipients.  Contact your administrator"

(where MY_DOMAIN.COM is my actual domain name used...)
         

I assume this is some sort of spam related issue because all the addresses are using my domain name and just replacing the first part of the email address each time. I am getting about 7 or 8 a day now. Is there anything that might be causing this that I can resolve?

I am using Avast Antivirus on the server and client pc's..

dc
dercossAsked:
Who is Participating?

Improve company productivity with a Business Account.Sign Up

x
 
nitadminConnect With a Mentor Commented:
No, this is not spam e-mail.

Your exchange server is not configured correctly.
Please check Default SMTP Virtual Server configurations and the Connector configurations.

Cheers,
NITADMIN
0
 
dercossAuthor Commented:
What am I looking for in particular?

dc
0
 
dercossAuthor Commented:
I've had a dig about and I've found that the emails are all related to 4 virtual SMTP servers that I can see when I got to SERVERS -QUEUES. Should these virtual servers be here at all? They are nothing to do with my server..

dc
0
Making Bulk Changes to Active Directory

Watch this video to see how easy it is to make mass changes to Active Directory from an external text file without using complicated scripts.

 
Pushpakumara MahagamageVPCommented:
some time it may be a Reverse NDR attack. check your NDR rules if any.

and do you have spam filter on your exchange? http://www.microsoft.com/technet/prodtechnol/exchange/downloads/2003/imf/default.mspx

pk
0
 
dercossAuthor Commented:
I don't have any NDR rules that I know of. Where would I check for them? I don't have any 3rd party spam filer running either. I have Avast Antivirus fro SBS 2003 installed but I don't think that has a spam filter on it..

dc
0
 
dercossAuthor Commented:
I've worked though the Microsoft suggestions above and so far I haven't had the problem happen reappear. I'll get back tomorrow with an update..

dc
0
 
dercossAuthor Commented:
Ignore the "happen" between "problem" and "reappear"... oops..

dc
0
 
dercossAuthor Commented:
Hmm. The problem is still there.

I have worked through some of the above and it appears that when I run Telnet as suggested  I get the following

250 2.1.5 user@spam.com

This apparently means my exchange server is an open smtp relay.

I have worked through the steps to stop this but it seems to make no difference. In fact, the settings are just as the article describes them.

What could I be doing wrong here??

dc
0
 
dercossAuthor Commented:
Also, under the PROTOCOLS - SMTP - DEFAULT SMTP SERVER - PROPERTIES - ACCESS, there is an entry for the the internal IP addrress of the server (192.168.0.6) and also one for 127.0.0.1. Is this correct?

dc
0
 
Pushpakumara MahagamageVPCommented:
you should close relay if it's not relevent for your issue..

at my exchange server i have selected only the list below and the list is empty, and selected allow all computers which sussesfully ath....

pk
0
 
Pushpakumara MahagamageVPCommented:
0
 
dercossAuthor Commented:
That's the kb I worked through but I must be doing something wrong because the SMTP Open Relay is apparently still there...

dc
0
 
Pushpakumara MahagamageVPCommented:
why do you add 127.0.0.1 ? and what happend when you remove 127.0.0.1

pk
0
 
dercossAuthor Commented:
I don't remember adding it. I have taken in out to see what happens.. I'll be back..

dc
0
 
dercossAuthor Commented:
I've now found that some of the emails leaving my network get "stuck" on the Exchange Server. If I go into the Queue I can see some emails on various SmallBusiness SMTP Connectors. If I right click and select "force connection" and then refresh it seems the emails are then sent.

I am getting more confused by the day here...

dc
0
 
dercossAuthor Commented:
And now my email seems to have dried up completely...

dc
0
 
dercossAuthor Commented:
I seem to have solved the problem by deleting the existing SMTP connector and running the CEICW again. I think the DNS servers were originally part of the problem. Apparently they should have been changed to new ones according to my ISP. I think my fiddling around just made the problem worse..

I'll see how it goes over the next day..



dc
0
 
dercossAuthor Commented:
A day later and all still seems ok..

dc
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.