my server as a massive sending mail

[Compadre]

Hi there, i need help, actually i have fedora core 6 with ispconfig, but i have problems with mail, all work fine, but i dont now why someone is using my mail server for massive sending mail from an account that i dont now: mail@settonsolutions.com in my server to a lot of email accounts. For now i take his ip a put on host.deny file, i dont is this work, but plis help to find this hole, and protect my server. Thanks

[falko]

To block an IP address, take a look here: http://www.howtoforge.com/forums/showpost.php?p=38142&postcount=4

What's in /etc/postfix/main.cf (please strip out the comments)? Are there lots of messages in your mailqueue (postqueue -p)?

You can test your system here if it's an open relay: http://www.spamhelp.org/shopenrelay/

[Compadre]

Thanks falko, yes there was a lot of messages in the mailqueue, also i had an open relay, some friend help via ssh, but i dont now what he do, he tell me that was the open relay. Now i dont have any problem. But i wanna now more about the configuration to close de open relay, can you give me some info about?
Thanks

[denmaus]

Thanks falko, yes there was a lot of messages in the mailqueue, also i had an open relay, some friend help via ssh, but i dont now what he do, he tell me that was the open relay. Now i dont have any problem. But i wanna now more about the configuration to close de open relay, can you give me some info about?
Thanks


this site could help you: http://www.clarkecomputer.com/info/openrelay.html

google for close Open Relay SMTPclose open relay "your mail server e.g. postfix" or something like that