Types of E-Mail Abuse where the Sender Address is Forged
Spammers – As they want to avoid receiving non-delivery notifications (bounces) to their real addresses.
Fraudsters – As they want to cover their tracks and remain anonymous.
Computer worms – Worms want to cause confusion or just don’t care about which sender addresses they use.
Phishers (password fishers) want to impersonate well-known, trusted identities in order to steal passwords from users.