How to fix Gmail server error occurred and your email was not sent #76997?

Problem

When you trying to send an email using Gmail account, an error prompt “Oops… a server error occurred and your email was not sent. (#76997)”.

Solution 1: Clear Browsing Data on Browser

For Mozilla Firefox

1. Open Mozilla Firefox.
2. Click on library-like button located at the top right part of the browser’s window.
3. Navigate to History > Clear Recent History…
4. Under the Time range to clear setting, choose Everything by clicking the arrow which will open the dropdown menu.
5. Check at least Cookies and Cache, click on Clear Now.
6. Restart browser.

For Google Chrome

1. Open Google Chrome.
2. Click on the three vertical dots in the top right corner of its window.
3. Navigate to More tools > Clear browsing data.
4. Choose the beginning of time setting as the time period and select at least cache and cookies to delete.
5. Click on Clear data button.
6. Restart computer and disconnect network from computer.
7. Open Google Chrome, again click on the three dots and select Settings > Advanced settings.
8. Open Content > See all cookies and site button.
9. Click on Remove all button.
10. Restart computer.

Solution 2: Log out Gmail Account then Login Again

Solution 3: Uninstall Google Earth

1. Login Windows as Administrator.
2. Go to Start > Control Panel > Settings app > click on Uninstall a Program under the Programs section.
3. Click on Apps to open a list of all installed programs.
4. Locate Google Earth entry and click on it once.
5. Click on Uninstall button.
6. Restart computer.

Solution 4: Add Exception for Google Servers for AVG

1. Open AVG user interface.
2. Right-click on the icon in the system tray and choose Open
3. Navigate to Menu > Settings > Components tab.
4. Click on Customize button next to the Web Shield entry and navigate to Exceptions tab.
5. Under the URLs to exclude part type in the following entries:

   google.com/*
   *.google.com