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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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
Business Accounts
Answer for Membership
by: SembeePosted on 2004-08-23 at 09:21:32ID: 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.c
Simon.