After Chinese hackers broke into Google's services, it has tightened up Gmail encryption. All Gmail accounts will automatically be set in an "https" mode. HTTPS encryption keeps your mail secure as it travels between your web browser and Gmail servers.This added layer of security can make Gmail slower, so if you don't use unencrypted wireless connections, you can choose to disable this option in your account Settings. Even if you change this setting, Gmail will always encrypt the login page to protect your password. If you trust the security of your network, you can turn this feature off at any time.
To disable or re-enable this feature in Gmail:
1.Sign in to Gmail.
2.Click Settings at the top of any Gmail page.
3.Set 'Browser Connection' to 'Don't use https' or 'Always use https.'
4.Click Save Changes.
5.Manually change the URL to http://mail.google.com to start accessing Gmail via http.
The shift to the more secure setting began late Tuesday, just a few hours after Chinese hackers attacks. Google is now considering pulling out of China and shutting down its search engine there because of the attacks.
If you’re more interested in speed than security, you can switch off HTTPS in the Gmail settings menu.