how to find out who is spamming on qmail with courier-imap?
I own a server with plesk on it
It is using qmail and courier-imap
When looking in the mail queue I detected a lot of spam messages
Can somebody tell me how can I find out who is sending spam through my server, how is he doing it(via php/html scripts or via shell?), how can I prevent this from happening in the future?
Are there any tehniques in detecting the spammer?