One of the oldest tricks in the book for spammers is to spoof or forge the "From" address so that the email appears to come from a legitimate source.
This month, Symantec is introducing DMARC Validation as a free upgrade for Email Security.cloud customers, further enhancing our protection against these types of spam, targeted attacks and phishing messages.
Once customers enable this new functionality, Symantec will automatically check if sending domain owners have a published DMARC policy and check that the email is legitimate.
Big, popular brands are often used in phishing and scam email attacks and I'm sure you've seen some of them first hand.
This is why over 80,000 domains have published DMARC policies and since 2011 it has been quickly adopted by some of the largest global brands and email senders such as Paypal, Twitter, Outlook.com, Yahoo! Mail, Facebook, LinkedIn and Bank of America.