How do I prevent someone from using my email address to send email (email address "spoofing")?

The basic email standards unfortunately do not include a check of whether or not someone is allowed to use an address on the From line when sending an email. This means that messages with spoofed From addresses fall into the broad category of spam and are subject to all the imperfections and difficulties of spam classification. There are a few technical things your department could consider doing to make spoofing easier to detect and stop. Please have your department technical support check the Email Spoofiing Counter Measures page for more information.