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Exchange 2000 - Blacklisted and SMTP queues piling up

Posted on 2004-08-23
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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
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Question by:Dutchesc
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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.
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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
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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.
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