Email authentication is already a part of email server best practices, and properly implemented it represents a valuable solution to some phishing attacks. However, it is not a universal solution to email phishing.
It is worth noting that the display name and address in an email can be easily forged by a phisher. If an email’s content is already suspicious, just looking at the “From” field will not be conclusive, as this field can be modified too. Also, unless you are certain that the links in an email message point to an organization’s legitimate site (and not a plausible-sounding but fake one) then you should not click on them.
Read more about how Cybercriminals Dodge Email Authentication here - http://blog.trendmicro.com/trendlabs-security-intelligence/how-cybercriminals-dodge-email-authentication/