E-mail spoofing is used to define fraudulent email activity where the sender address and some additional parts on an email header are adjusted to look as if the email came from another source. This mischievous technique is used mostly for sending spam emails and phishing to camouflage the origin of the email. By altering certain parts of the email which are found in the header, scammers and spammers can hide behind an email and make it appear as if it was from someone else.

 
Email spoofing usually follows website spoofing which is when a website is made to copy the look and feel of another popular and trusted website but is really run by scammers with bad intentions.