Spam E-mail

In short: Spam e-mails are unwanted mass mails with advertising, fraud or malware.

In more detail: A large share of worldwide mail traffic is spam. It is often sent via botnets.

In Depth

Dangers

Fraud, phishing, malware in attachments, waste of time and storage.

Filters

Server-side spam filters, SPF/DKIM/DMARC, blocklists. Mail programs learn from “Mark as spam”.

See also: Spam, Phishing Mails, Botnets