Google will next week begin a gradual deprecation of unsafe crypto protocol SSLv3 and cipher RC4 in Gmail IMAP/POP clients.
Google announced this week that it will begin to disable SSLv3 and RC4 a month from now, on June 16.
As expected, Google formally announced its intent to move away from the stream cipher RC4 and the protocol SSLv3 this week, citing a long history of weaknesses in both.
The IETF, in RFC7568, declared SSLv3 “not sufficiently secure” and prohibited its use. SSLv3 fallbacks were to blame for the POODLE and BEAST attacks.