Richi posted a nice introduction on how spammers actually send the millions of spam mails every day. He begins by describing two ways of sending spam mails: traditional and viral.
This is the email category containing all messaging and emailing articles, tutorials and reviews. The category includes web-based email services such as Gmail, Hotmail, Outlook or Yahoo Mail, as well as desktop-based email clients and readers like Mozilla Thunderbird or Microsoft Outlook.
Electronic mail enables Internet users to exchange messages in a similar fashion as the mail system is working. Senders can compose emails in their programs, either on the web or in programs, and send them to recipients that they add to the To, CC or BCC lines of the email using email addresses. It usually takes a couple of seconds before emails arrive at their destination. Emails can contain textual contents but also attachments such as images or other files.
Email accounts are often used to verify people on the Internet, which is why malicious users often try to get access to email accounts for their malicious activities. Attacks include so called phishing attacks where emails look as if they come from an authority but are in fact forgeries that try to lure users into revealing important data such as passwords or credit card numbers
This short guide has the intention to provide even new users with an easy way to enjoy the internet. A big problem that stands between the enjoyment is mail spam or simply spam.