find the MAIL FROM address, and if they reply to the email, it will go to either the address presented in the From: or Reply-to: header, but none of these addresses are typically reliable, so automated bounce messages may generate backscatter. Although email spoofing is effective in forging the email address, the IP address of the computer sending the mail can generally be identified from the "Received:" lines in the email header. In malicious cases, however, this is likely to be the computer of an innocent third party infected by malware that is sending the email without the owner's knowledge. Malicious use of spoofing Phishing and business email compromise (see below) scams generally involve an element of email spoofing. Email spoofing has been responsible for public incidents with serious business and financial consequences. This was the case in an October 2013 email to a news agency which was spoofed to look as if it was from the Swedish company Fingerprint Cards. The email stated that Samsung offered to purchase the company. The news spread and the stock exchange rate surged by 50%. Malware such as Klez and Sober among many more modern examples often search for email addresses within the computer they have infected, and they use those addresses both as targets for email, and also to create credible forged From fields in the emails that they send. This is to ensure that the emails are more likely to be opened. For example: Alice is sent an infected email which she opens, running the worm code. The worm code searches Alice's email address book and finds the addresses of Bob and Charlie. From Alice's computer, the worm sends an infected email to Bob, but is forged to appear as if it was sent by Charlie. In this case, even if Bob's system detects the incoming mail as containing malware, he sees the source as being Charlie, even though it really came from Alice's computer. Meanwhile, Alice may remain unaware that her computer has been infected, and Charlie does not know anything about it at all, unless he receives an error message from Bob. How does email spoofing differ from spam and email phishing? The main difference between spam and a spoofed message is that spammers don't edit email headers to pretend the email was sent from someone else. Both phishing and spoofing emails aim to trick someone to believe the