What is Email Spoofing? | UpGuard

This report explains email spoofing as a technique, outlining how SMTP’s lack of native authentication enables forged sender addresses used in phishing, BEC, and malware delivery, and detailing mitigation via SPF, DKIM, and DMARC (with configuration basics, limitations like false positives and replay, and DNS-related risks), as well as how envelope (MAIL FROM, RCPT TO) and header (FROM, REPLY-TO) fields are manipulated to deceive recipients.