Google has made some changes to Gmail to protect users from malicious
links and state-sponsored attacks. When users click on suspicious links
that arrive in email, Gmail will display a full-page warning them that
visiting the site could harm their computer. Users will be able to
choose to click through to the site. Google will also display a
full-page warning when it believes state-sponsored attackers have
targeted users. Google's blog post also notes the company's
participation in submitting a draft IETF specification for SMTP Strict
Transport Security, which aims to "ensure TLS encryption works as
intended."
http://www.scmagazine.com/google-enhances-gmail-security-to-thwart-malicious-links-state-sponsored-cyberattacks/article/485604/