Third-party app developers can view the email content of Gmail users. This can happen to anyone who installs these applications and sign up for a particular service ..
In response to this, the owner of Gmail, Google, said the third-party app will not read your email but can still do so in “the very specific case where you grant permission, or where we need it for security purposes, such as investigating bugs or misuse . ”
In addition, Google provides steps that can be taken to prevent third parties from reading the contents of emails on Gmail accounts. Here are the steps:
Step 1: Sign in to the Google Security Checkup page. (https://myaccount.google.com/security-checkup/3)
This page not only shows the latest devices from where you are logged in to your Google account, but also third-party apps that you may have given permission to access your account information and you may have forgotten.
Step 2: Scroll to the bottom of the page and click on Third party access.
In that option you’ll see a list of all apps that have access to your Google / Gmail account. Clicking on each app will also show you what specific services the app can access.
Step 3: If you want to remove the app’s access from your Google account, just click on Remove Access.