Support Disabled for SSLv3 and RC4 for Gmail SMTP/IMAP/POP

June 24, 2016

Effective June 16, 2016, Google has disabled support for two security systems called SSLv3 and RC4 support at Google's SMTP servers, IMAP/POP clients, and on Gmail's web servers for the following reasons:

If you are still using SSLv3 or RC4: 
  • Google recommends reviewing the suggested actions in the Security Blog announcement and updating to modern TLS configurations
  • Some common systems that may still be using SSLv3: inbound/outbound gateways, third-party emailers, and systems using SMTP relay
Servers sending messages via SSLv3 and RC4 will no longer be able to exchange mail with Google’s SMTP servers, and some users using older and insecure mail clients won't be able to send mail.