Solved

Exchange 2000 - Blacklisted and SMTP queues piling up

Posted on 2004-08-23
3
363 Views
Last Modified: 2006-11-17
My domain has two Exchange server in two different locations

I have turned off open relaying on both and Access Authentication has been checked

I am not sure why but my SMTP queues are piling up and my Exchange server is slowing down.

Help.

Steve

Note: Windows 2000 Server, Exchange 2000 SP4
0
Comment
Question by:Dutchesc
  • 2
3 Comments
 
LVL 104

Accepted Solution

by:
Sembee earned 500 total points
ID: 11872062
Probably an NDR attack. This is where messages are sent to your server with a non valid email address on purpose and your machine bounces them back as NDRs. The From line has been spoofed to be the real recipient of the message.
Disable NDRs in ESM which will stop more messages flowing out.

If it isn't that then it could be an authenticated SMTP relay. This is where a password on your system has been guessed and you are allowing SMTP traffic through. Do you have any one collecting email through Outlook Express and then sending through your server? If not, disable this feature as it isn't required.

Then take a look at this article from Microsoft on how to clean up: http://support.microsoft.com/default.aspx?kbid=324958

Simon.
0
 

Author Comment

by:Dutchesc
ID: 11872407
As far as the NDR attack is concerned the email addresses are not being spoofed to be real sent froms. So could this still be a possiblity?

I do not believe that anyone is collecting email through OE.

Finally We are not using SBS, is there anyway to clean the queues within Exchange Server 2000?

Thanks,
Steve
0
 
LVL 104

Expert Comment

by:Sembee
ID: 11872432
I should have said ignore the SBS reference as it is the same technology - SBS uses Exchange. I don't think there is a version of the article just for Exchange.

Simon.
0

Featured Post

Problems using Powershell and Active Directory?

Managing Active Directory does not always have to be complicated.  If you are spending more time trying instead of doing, then it's time to look at something else. For nearly 20 years, AD admins around the world have used one tool for day-to-day AD management: Hyena. Discover why

Question has a verified solution.

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

ADCs have gained traction within the last decade, largely due to increased demand for legacy load balancing appliances to handle more advanced application delivery requirements and improve application performance.
Not sure what the best email signature size is? Are you worried about email signature image size? Follow this best practice guide.
In this video we show how to create a User 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 >> Mailb…
In this video we show how to create a Contact 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 >> Contact ta…

895 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

Need Help in Real-Time?

Connect with top rated Experts

16 Experts available now in Live!

Get 1:1 Help Now