Gmail users can select Hyper Text Transfer Protocol Secure (HTTPS) as their default connection. HTTPS is a secure protocol that provides authenticated and encrypted communication.
Google says that "If you sign in to Gmail via a non-secure Internet connection, like a public wireless or non-encrypted network, your Google account may be more vulnerable to hijacking. Non-secure networks make it easier for someone to impersonate you and gain full access to your Google account, including any sensitive data it may contain like bank statements or online log-in credentials. We recommend selecting the 'Always use https' option in Gmail any time your network may be non-secure. HTTPS, or Hypertext Transfer Protocol Secure, is a secure protocol that provides authenticated and encrypted communication."
How to configure Gmail to use HTTPS as default connection method?
1. Click Settings at the top-left side of Gmail page.
2. Go to General tab (Default is Genaral tab)
3. You can see 'Browser Connection' settings on the bottom side of the General settings page, Select to 'Always use https'.
4. Click Save Changes.
5. Reload Gmail.
Now your Gmail accounts is using HTTPS.