Learn in the textbookMalware Distribution Routes and Extortion Tactics
DefinitionSpam email (迷惑メール) is email that recipients do not want, sent to them unilaterally for advertising, fraud, distributing malware and similar purposes.
ExplanationThe basic response is to delete it without replying and without opening any links or attachments in it. Replying tells the sender the address is actually in use, which can bring in even more mail. On the receiving side, mail can be sorted with a blacklist method that registers senders to reject or a whitelist method that registers senders to accept.
AnalogyIt is like flyers nobody asked for being stuffed into your mailbox, with a few among them pretending you won a prize so they can get your contact details.