Google: Sign-in attempt prevented while using STMP

Oflate if you are facing authentication issues while sending your emails via google STMP connection and getting emails like

Subject: Sign-in attempt prevented


Hi,
Someone just tried to sign in to your Google Account abcdeveloprs@gmail.com from an app that doesn't meet modern security standards.
Details:
Thursday, January 21, 2016 12:17 PM (Eastern Standard Time)
Bridgeport, CT, USA*
We strongly recommend that you use a secure app, like Gmail, to access your account. All apps made by Google meet these security standards. Using a less secure app, on the other hand, could leave your account vulnerable. Learn more.

Use this setting to make is accessible

https://www.google.com/settings/u/0/security/lesssecureapps

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