Flooding is the technique of sending a large amount of messages to one address. Flooding can occur on any type of software that provides the ability to send / relieved personal messages. The most popular applications that are flooded are email inbox's and personal accounts at forum message boards. Flooding can cause major problems if done on a large scale, such as flooding numerous email accounts on the same server. This can lead to the server running a lot slower or being completely taken off-line.