Ok, now I`m sure the server is used to send spam.
Mail log is getting wery wery big.
Guess it`s brute force password guessing....
How can I see witch account the spam is beeing sent from (not e-mail account but autenticated smtp account).
Is there any way to filter outgoing mail from postfix, to take care of the worst?
I guess some users have changed to week passwords in mailuser setup, is there any way to set a strong password policy in ispconfig so they dont do this?
I really need help now before I get blacklisted and things get out of hand