The "Set Forwarding to Email" feature in Gmail allows users to automatically forward incoming emails to another email address. This is a useful tool for those who need to access their emails from multiple accounts. However, it's important to ensure that the forwarding settings are configured correctly to avoid potential privacy and security issues.

Causes

• Incorrect forwarding settings
• Filters applied to incoming emails
• Forwarding to an inactive or non-existent email address
• Account security issues such as unauthorized access or compromised password
• Technical glitches in Gmail servers or network connectivity issues.

Solution 1: Check the forwarding settings and make sure they are correctly configured

1. First of all, open Gmail and log in to your account.
2. Then, tap on the gear icon in the top right corner and select Settings.
3. After that, open the Forwarding and POP/IMAP tab.
4. Check the Forwarding section to ensure that it is enabled and that the correct email address is entered.
5. If necessary, add a new email address by tapping "Add a forwarding address" and following the prompts.
6. To verify the email address, Gmail will send a confirmation code to the address provided.
7. In the next step, enter the code in the relevant field.
8. Once the address is confirmed, select "Forward a copy of incoming mail to" and choose the appropriate email address from the drop-down menu.
9. Select additional options if desired, such as keeping a copy of forwarded emails in your inbox or marking them as read.
10. Lastly, hit Save Changes to ensure the forwarding settings are saved.

Solution 2: Disable interfering browser extensions for Gmail

1. Open your browser and click on the three dots in the upper-right corner.
2. Select "More tools" and then click on "Extensions".
3. Find the extension that may be causing the issue and toggle the switch to disable it.
4. Restart your browser and check if the issue is resolved.
5. If the issue persists, try disabling all extensions and then re-enabling them one by one to identify the problematic one.
6. Alternatively, try using a different browser to see if the issue is isolated to a specific browser.

Solution 3: Clear the cache and cookies in your browser

1. To clear the cache and cookies in your browser, open your browser settings. 
2. After that, select the option to clear browsing data. 
3. From there, choose the time range you want to clear.
4. Then, select the cache and cookies options. 
5. Finally, tap on the clear data button to complete the process.

Solution 4: Try accessing Gmail from a different browser or device

1. In the beginning, open a different browser or device.
2. Visit the Gmail official website and log in with your credentials.
3. Check if the forwarding settings are correctly configured.
4. If not, you need to update the forwarding settings.
5. Lastly, send a test email to check if the issue is resolved.