[ubuntu] Postfix is sending spam

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http://ubuntuforums.org – Hi everyone, My postfix server is sending spam and has thus been blacklisted from both yahoo and hotmail. Going through my config, it seems to be "locked down," but anyone can telnet in and send email using ehlo. Can anyone explain how I can stop that? I'm probably confused, but everywhere I read, it says you can require a username/password, but then anyone connecting needs that username and password. If I set that up, would Google, Yahoo, etc need that password to connect to my server? Below is a sample of what I'm getting in my logs: Quote: (Hardware)