Google announced this week that it will begin to disable SSLv3 and RC4 a month from now, on June 16. The company is urging any organizations on Google Apps still using either RC4 or SSL v3 to update to a more modern TLS configuration. For nearly half of the cipher s existence, researchers have been aware of a weakness that could allow an attacker to decrypt the keystream. An Internet Standards Track document published by the Internet Engineering Task Force (IETF) in June outright called SSLv 3 not sufficiently secure
Source: https://threatpost.com/google-set-to-kill-sslv3-and-rc4-in-smtp-gmail-in-june/118153/