To see which application you have authorized to read email, use Security Checkup for Gmail.
Step 1 : Log in to your Gmail account, go to Settings and find Apps with Account Access under Sign-in and Security.
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Find a list of licensed applications
Step 2 : Click Manage Apps to open the list of applications linked to Google.
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Open the list connected to Google Gmail
Step 3 : At the list above, select Remove Access to remove the previously granted rights.
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Removing Gmail access has been given to 3rd party applications
To ensure the safety of your information, think carefully before empowering 3rd party applications.
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