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

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
OCUBEAsked:
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PerfectPCFixConnect With a Mentor Commented:
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.
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PerfectPCFixCommented:
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???
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OCUBEAuthor Commented:


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
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sgerlingCommented:
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.
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kieran_bCommented:
By default, authenticated relaying is enabled - it could be that someone has guessed your administrator password
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FmatiasCommented:
Are those regular emails or NDR?
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OCUBEAuthor Commented:
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?
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FmatiasConnect With a Mentor Commented:
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.
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kieran_bConnect With a Mentor Commented:
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
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