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My server is sending spam


I am a local cable operator running an ISP service.

I am using a linux server and using it as a proxy server. The problem is that whatever IP I use on server, it is blacklisted whithin a few days as a spamming server.

How can I stop my server from sending spam.

Thanks in adavnce

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3 Solutions
Which MTA?
In general, don't relay any mail, except the user authenticated(smpt auth)
Or Your system was infiltrated(and spam is sent from localhost)...
there is another thing that also get''s your ip blacklisted: if your io is not found in the MX records of your domain, in which case it is considered as a spam server. also, check your logs and make sure that none of your clients spam ... this is also a possibility. and as ravenpl suggested, make sure your email server is not relaying unwanted email (the configuration for this depends on your mail server).
type: replace "f your io" with "f your ip" :)
Gabriel OrozcoSolution ArchitectCommented:
Other thing that can be possibly happening is

a) your proxy server it's open. so outsiders are using it to send spam. with some ACL's you can restrict to your clients only

b) one of your clients is sending spam. you must identify him/her and stop traffic from that internal ip address while applying what the user contract says about spam...

c) apache acting as an open proxy (if apache is configured as a reverse proxy, this can happend if you were not careful enough)

d) your iptables has forward policy in ACCEPT (this is much more dificult to do, however. a spammer would try the other possibilities first)

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