More informations:

nternet bots, also known as web robots, WWW robots or simply bots, are software applications that run automated tasks over the Internet. Typically, bots perform tasks that are both simple and structurally repetitive, at a much higher rate than would be possible for a human alone. The largest use of bots is in web spidering, in which an automated script fetches, analyses and files information from web servers at many times the speed of a human. Each server can have a file called robots.txt, containing rules for the spidering of that server that the bot is supposed to obey.

Mail Security is necessary:

The security of your site against spam is becoming increasingly important because the threats magnification of day to another, why Mail Security offers the possibility to filter every mail on your site from ignoring all attempts and fraud . Rating system is to verify the DNS domain used to verify the existence of the address, so we take care of verifying the nature of the operation and filter spam bots.