How To Fix Gmail SMTP Authentication Failed?

Gmail SMTP Authentication Failed

The section below will help you to solve the Gmail SMTP Authentication failed issue.

  • Step : 1 First of all, make sure that you have configured your Gmail account properly.
  • Step : 2 Check if your Gmail SMTP settings match with the information given below.
  • Step : 3 SMTP server address:
  • Step : 4 Use authentication & secure connection: Yes
  • Step : 5 Username and password: Gmail account email address and password.
  • Step : 6 Port number (SMTP): 465 (SSL required) or 587 (TLS required)
  • Step : 7 If the above settings do not match with your Gmail account settings, then re-configure your email account and check if the issue has been resolved.
  • Step : 8 Make sure that you’re using a valid username and password.
  • Step : 9 Check if you have enabled the Less secure apps option.
  • Step : 10 If not, enable it and check if the Gmail SMTP Authentication failed issue is resolved.
  • Step : 11 To enable the Less secure apps option, follow the instructions given below.
  • Step : 12 From your computer’s web browser, sign in to your Gmail account and go to the Settings page.
  • Step : 13 Go to the Less Secure apps page.
  • Step : 14 Click the toggle button beside the Allow less secure apps: ON option.
  • Step : 15 After an hour, check the mail application.
  • Step : 16 If the SMTP Authentication failed issue remains unresolved, check if the SMTP mail server option is enabled.
  • Step : 17 If not, enable it and check again.
  • Step : 18 Try to use an App password to solve this issue.
  • Step : 19 To create and use App passwords, follow the instructions given below.
  • Step : 20 Sign in to your Google Account.
  • Step : 21 Select the Security option.
  • Step : 22 Navigate to the Signing into Google section and click the App Password option.
  • Step : 23 Select the app in which you are using your Gmail account.
  • Step : 24 Click the Generate button.
  • Step : 25 Follow the prompts displayed on the screen.
  • Step : 26 Once the password has been generated, click Done.
  • Step : 27 Now, check if the Gmail SMTP Authentication failed issue is resolved.


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