Solved

EXCHANGE SMTP QUEUE SHOWS EMAILS FROM A SENDER NOT FROM OUR DOMAIN

Posted on 2008-06-21
11
668 Views
Last Modified: 2008-09-17
We have a SBS 2003 server with Microsoft exchange 2003 mail server.

Recently we have seen that the SMTP queue in the exchange system manager shows up 100's of emails
in the queue . When I opened up some of the email properties to see the sender address, it shows up some
other email id, which is not from our domain.   Looks like some 3rd party email id.


1)  Is someone trying to send emails from our mail server ?

2)  Our exchange server is not set to relay.

Any suggestions as how this can be controlled or is it something which is not to be worried about ?


Thanks
0
Comment
Question by:OCUBE
  • 2
  • 2
  • 2
  • +2
11 Comments
 

Expert Comment

by:PerfectPCFix
ID: 21839737
What kind of security do you have in place? Trend Micro, Bit Defender,/ Ect...??? How many users do you have? Are you using your own mail server or are your MX records ect outsourced? POP 3??? What is the content of these emails???
0
 

Author Comment

by:OCUBE
ID: 21839749


1) we have snapgear sg580 firewall on the gateway
2) we have symantec mail security on the exchange server
3) Mx records are set in our domain registrar login pointing our internal ms exchange server IP adress
0
 
LVL 1

Expert Comment

by:sgerling
ID: 21839848
Use an open relay tester such as:
http://www.spamhelp.org/shopenrelay/

You did indicate your server is configured not to relay messages, but it would still be a good idea to test it.  There could be a setting that is incorrect.
0
Ransomware: The New Cyber Threat & How to Stop It

This infographic explains ransomware, type of malware that blocks access to your files or your systems and holds them hostage until a ransom is paid. It also examines the different types of ransomware and explains what you can do to thwart this sinister online threat.  

 
LVL 25

Expert Comment

by:kieran_b
ID: 21839928
By default, authenticated relaying is enabled - it could be that someone has guessed your administrator password
0
 

Accepted Solution

by:
PerfectPCFix earned 168 total points
ID: 21841053
Sounds more like you are being targeted by a spammer. What domain are they from? Variouse ones? I would look into a spam filter. There are some for SBS and some 3rd party you can rout your incomming mail through. Trend Micro has one and there is one at www.no-ip.com. There are many others too.
0
 

Expert Comment

by:Fmatias
ID: 21867766
Are those regular emails or NDR?
0
 

Author Comment

by:OCUBE
ID: 22103040
These emails comes in hundreds some times and thousands some times and sits in queue.
They are from different sources and different domains and most of them TO: address will be NONE
I had found the following words on those emails :

Delivery to the following recipients failed
THIS IS A WARNING MESSAGE ONLY
EPPICard - support@yahoo.com
Delivery Status Notification (Failure)
and so on..

I had checked and found my domain is looks good with the tools for mx and other records.
No open relay enabled on mail server

Any good thought to over come these issues?
0
 

Assisted Solution

by:Fmatias
Fmatias earned 166 total points
ID: 22103255
Well see if this helps http://support.microsoft.com/kb/886208

I had a problem like that a while back because someone messed up in setting up an Exchange box. I had like 70.000 NDR and the server just freezed.
0
 
LVL 25

Assisted Solution

by:kieran_b
kieran_b earned 166 total points
ID: 22106872
If the TO address is none, it means you are bouncing attempted spam - you are causing NDR spam.

You need to enable recipient filtering and tarpitting -> http://www.amset.info/exchange/filter-unknown.asp

Then, to clear the queues, you need to follow this -> http://www.amset.info/exchange/spam-cleanup.asp

Kieran
0

Featured Post

Are your AD admin tools letting you down?

Managing Active Directory can get complicated.  Often, the native tools for managing AD are just not up to the task.  The largest Active Directory installations in the world have relied on one tool to manage their day-to-day administration tasks: Hyena. Start your trial today.

Question has a verified solution.

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

Suggested Solutions

Lotus Notes – formerly IBM Notes – is an email client application, while IBM Domino (earlier Lotus Domino) is an email server. The client possesses a set of features that are even more advanced as compared to that of Outlook. Likewise, IBM Domino is…
Following basic email etiquette rules will help you write a professional email and achieve a good, lasting impression with your contacts.
In this video we show how to create a Shared Mailbox 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 Recipients >> Sha…
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…

772 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