How to Stop Third-party Apps From Reading Your Emails:

Just Follow these simple steps to stop third-party apps to access your emails

Step 1: Open your email and click on your profile picture in the top right corner.

Step 2: Click on My Account or Google Account which will send you to the Settings page.

Step 3: Tap on Security tab and scroll down and click Manage third-party access

Here, you’ll find a small list of some of the apps that have access to some portion of your Google account. At some point, you consented to all of these apps, though they may or may not apply to your actual Gmail account. Click the “Manage Apps” link to gain access to the actual permissions these apps have.

Step 4: Click on the app which you want to block from accessing your email

Next, to each app in the list, it’ll indicate what part of your Google account it has access to. If you use an Android device, you might see a variety of games and apps that only have access to your Google Play Account.

However, it says it “Has full access to your Google Account,” that includes your email in Gmail. According to Google’s own statements, that means the apps may be able to scan your emails and take any information they receive.