Hello I'm new to the forum and I hope to get some help. In the last couple of day I have had some problems with spam being sent from my server. I believe the problem it originates from a joomla site or a custom made php site, I know the problem isn't ISPconfig. My question is this: Can I blacklist all emails going out of the server which doesn't match any domain name under "Clients"? All the mail are being "spoofed" as yahoo, drug sites and gambling sites. I know isn't a viable fix, but I hope it can buy me some time. I have played arround with "Email -> Global Filters -> Postfix Blacklist" but without luck. Another question... Is it possibale to get an email when the server is overloaded? Furthermore... I will happily accept any advice/tips/suggestions.