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Email Error Code 400

  • The Email error code 400 indicates a Bad Request error. That means the request you have sent was incorrect or corrupted and not understood by the server. To solve the Bad Request error code 400, perform the troubleshooting instructions given below.
  • Check if you have entered the correct or valid URL code.
  • Incorrect URL code may also lead to this issue.
  • Re-check the URL code you have entered and then check if the issue is solved.
  • Make sure that your web browser’s cookies are not corrupted.
  • If the browser’s cookies are corrupted, then you may experience the 400 error.
  • Clear your DNS cache by running the ipconfig /flushdns command in the Command Prompt window.
  • If the email error code 400 persists, clear your web browser’s cache. 
  • To clear Google Chrome’s cache via shortcut keys, follow the step-by-step instructions given below.
  • Locate the Ctrl, Shift, and Delete buttons on your system’s keyboard.
  • Press these three buttons simultaneously.
  • Now, a window displaying the Clear Browser cache message will appear on the screen.
  • Select the all, last day, last hour, last week, or last four weeks option based on your preferences.
  • Choose the selection and click the Delete Browser data button.
  • After that, refresh or reload the site.

Follow the troubleshooting instructions given below to solve the email error code 400 in Gmail.

  • Click the horizontal three dots icon available at the top-right corner of the screen.
  • Select the Settings option.
  • Click the hamburger icon.
  • Expand the Advanced option by clicking the down arrow beside it.
  • Select the Privacy & Security option.
  • Click the Content Settings option, followed by Cookies.
  • Check if any website or link is added under the block list.
  • If so, remove it, and click the Save button.
  • Now, check if the email error code 400 is resolved.
  • If not, click the Call button provided on this web browser.
Email Error Code 400