Anti mail-relay for IIS 4.0 running on WinNT4 Server

Posted on 2004-11-02
Last Modified: 2013-12-04
I have the a WinNT4 server installed with IIS4.0 running WWW, FTP and SMTP services.
They are all needed, which means turning it off is not an option.

The server is co-located at an ISPs data centre.

My question is related to the SMTP services.
I have already set the option not to relay mail, in the IIS Manager.
However, I can see that there are hundreds of mails being pumped out by my server from the queue.

I am running the latest version of TrendMicro OSCE 6.5 with patterns updated. No viruses/worms found.

I suspect the server is being used as a mail and spam relay.

How can I confirm this, and how can I stop it?
Question by:wlseet

    Author Comment

    I mean hundreds of mail every minute.
    LVL 11

    Accepted Solution

    turn on authentication for all smtp clients. send out an upate ahead of time to all clients. then on a specific date switch over. this forces only registered users to be abled to send out mail. it also makes it easier to see who is sending all the email.
    LVL 11

    Expert Comment

    by:Paul S
    check your logs and find the ip address. try running netstat to get the culprit ip address. then block the address from the router or firewall.

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