DDoS attacks. What are they and how can they hurt my email campaign?

I’m sure most of you will be familiar with DDoS (Distributed Denial of Service) attacks and might have even been affected by one, but if not, here’s a quick break down. A DDoS attack works by flooding a network / server / router with so much traffic that it can’t respond to regular requests, essentially clogging up the line and preventing it from functioning as expected. This type of scenario can happen when small sites are listed on high traffic sites like Slashdot or Reddit and then crumble under the weight of massively increased traffic, but more commonly it’s the result of a coordinated network of zombie computers, or a botnet, under the control of hackers or criminal organisations deliberately…