Spam is defined as unsolicited e-mail messages from unknown senders. They are almost always about selling you things. Since sending e-mails is very inexpensive, these kinds of advertising e-mails are sent by the millions. Even if only one recipient out of a thousand falls for it and reads the e-mail message, the spam campaign was already worth it.
How can I protect myself from spam?
Creating a personal e-mail address:
Senders of spam sometimes put together e-mail addresses by simply combining lists of names (Peter, Monica, etc.) and frequently used domains (such as sunrise.ch, bluewin.ch, etc.). Catchy addresses such as firstname.lastname@example.org are therefore more vulnerable to spam than addresses that are randomly pieced together, such as email@example.com
Cautious Internet behavior:
Many websites require that you enter your e-mail address. Consider carefully if you can trust a particular website because untrustworthy operators collect and sell addresses. Therefore, please be careful whom you share your address with.
Responding to unsolicited messages:
Unsubscribing to unsolicited messages often has the opposite effect. It tells the spam message sender that your address really exists and is in use. Only unsubscribe from services that you actually signed up for.
Listing your e-mail address:
Listing your e-mail address on your personal website is risky, since search robots roam all over the Internet to collect addresses.