There’s little you can do if you never had such problems in the past. DDOS is hard to battle with; you could get away by moving your box to another provider, bu

There’s little you can do if you never had such problems in the past. DDOS is hard to battle with; you could get away by moving your box to another provider, but the IP reputation and other misconfigurations & stuff might bite you back causing a huge pita. We rely on Mailinabox, which has fail2ban but the server being on a DigitalOcean network, they claim to offer some kind of DDOS protection.