How To Grant Permission To External Application To Use Gmail Account?

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Step1: Login with your Gmail Account.

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Step2: Click on My Account.

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Step3: Click on Device activity & notification.

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Step4: Enable Allow less secure apps.

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Step5: How to Unlock Captcha.

Visit below Link to unlock Captcha : https://accounts.google.com/DisplayUnlockCaptcha

Press Continue to allow Gmail.

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Step6: At last Sign out Account.