email spreading rumors; false information email
Refers to chain emails or messages that spread unverified rumors, hoaxes, or false stories, often with a sensational or alarming tone. Common in the context of internet hoaxes and misinformation.
チェーンメールでデマメールが回ってきた。
A rumor-spreading email came around as a chain mail.
その話はデマメールだとすぐにわかった。
I quickly realized that story was a hoax email.
Wasei-eigo (Japanese-made English) combining 'demagogue' (デマ) and 'mail' (メール). The term デマ itself is an abbreviation of デマゴギー (demagogy), referring to false or inflammatory information spread to manipulate public opinion.