Spam

A an email authentication protocol that detects forged sender addresses in email, like those used in phishing and email spam. DKIM lets receivers verify that an email sender was authorized by the owner of the domain.

A technique used in spam and phishing attacks to trick users into thinking a message came from a person or business they either know or can trust.

Bulk email that doesn’t fit the definition of spam because it’s solicited and comes from a legitimate source. It has varying values to different recipients.