In summary, if your application currently uses plain passwords to authenticate to Google, we strongly encourage you to minimize user disruption by switching to OAuth 2.0. … We've already implemented developer tools including Google Sign-In and support for OAuth 2.0 in Google APIs and IMAP, SMTP and XMPP, and we're always looking to raise the bar. Google announced the move to “force” others to use a new security feature, via their official Some Desktop mail clients like Microsoft Outlook and Mozilla Thunderbird The Mail app on your Windows phone preceding the 8.1 release The Mail app on your iPhone or iPad with iOS 6 or below Some examples of apps that do not support the latest security standards include: Since these apps and devices are easier to break into, blocking them helps keep your account safer. Google may block sign in attempts from some apps or devices that do not use modern security standards.

To solve it, you have to turn off a new google security feature.Īllowing less secure apps to access your account Today, i did, and got the error message. But i haven't launched it for several months. I use Thunderbird to download my emails to my computer.

Google Mail is blocking Mozilla Thunderbird to access gmail.

Mozilla thunderbird gmail