Hi

I have identified small amounts of spam being sent through my linux server over the past few weeks. Today this suddenly became 35000 messages and I've temporarily stopped smtp to stop the spam being sent.

Relays are being denied by the server- having been checked by my webhost and certainly appearing in the logs.

There are some indications that the spammers are using the server IP address to send the emails.

Can anyone advise on how to identify what is happening- and how to stop it? (I have shell access)

Thanks in advance