Google may block sign-in attempts from some apps or devices that do not use modern security standards. Since these apps and devices are easier to break into, blocking them helps keep your account safe.
Some examples of apps that do not support the latest security standards include:
- The Mail app on your iPhone or iPad with iOS 6 or below
- The Mail app on your Windows phone preceding the 8.1 release
- Some Desktop mail clients like Microsoft Outlook and Mozilla Thunderbird
If you want to change your account security settings to allow these apps despite the risks, use the following steps:
- Sign in to your Google account, if not already
- Click on the dotted icon on the top right to open your Google Apps menu
- Click on Account
- Click on Security on the left hand side