DDoS stands for "Distributed Denial of Service".
It is a criminal act that attempts to make a web site or other internet service unavilable by directing so much traffic at it that legitimate traffic has trouble getting through, resulting in a slow or inaccessible service.
All our servers are protected against DDoS attacks of all sizes, so you don't have to worry about a DDoS attack against you or another customer impacting your site.
Also ReadPHP mail() function disabled on Islandhosting.com
What are the ways I can pay?
Increasing, or decreasing your upload_max_filesize in php settings.