You could also have a looksie through the 59 threads showing results in this forum with the word 'emails' in them. I know that this has been discussed many many times.
"What, exactly, is the internet? Basically it is a global network exchanging digitized data in such a way that any computer, anywhere, that is equipped with a device called a 'modem', can make a noise like a duck choking on a kazoo." - Dave Barry