Wp Mail SMTP Error Could Not Authenticate

The reasons for the Wp Mail SMTP Error could not authenticate issue are listed here for your reference.

SMTP settings:

The necessary Gmail SMTP outgoing server settings are given below:

  • Step 1: Incorrect credentials such as username and password
  • Step 2: Reached the email sending limits
  • Step 3: The connection has been diverted to a different server
  • Step 4: You have only specified authentication without encryption

If the SMTP server could not authenticate problem on the WP Mail account, carry out the troubleshooting steps provided on this web page.

  • Step 1: Go to the WP Mail SMTP settings and check if the username and password are correct.
  • Step 2: The Username field should be the email address of the WP Mail account.
  • Step 3: Try to change the port from 465 to 587 and ensure that you have enabled the SMTP Auto TLS feature.
  • Step 4: Also, change the encryption to TLS.
  • Step 5: Encryption is mandatory to avoid unpleasant activities such as phishing, identity theft, eavesdropping, and stolen credentials.
  • Step 6: The WP Mail SMTP could not authenticate problem might also occur if you had reached the maximum sending limits.
  • Step 7: The antivirus or firewall running on your computer might interfere with the WP Mail account causing the SMTP server could not authenticate error.
  • Step 8: Try to disable the antivirus or firewall program on the computer and check if the WP Mail SMTP could not authenticate problem has been resolved.
  • Step 9: If needed, uninstall the antivirus or firewall program from the computer.
  • Step 10: Sometimes, enabling the Allow less secure apps feature might resolve the problem.
  • Step 11: Ensure that your DNS is working properly. Because the DNS failure will also cause the WP Mail SMTP could not authenticate problem.
  • Step 12: If the Wp Mail SMTP error could not authenticate problem has not been resolved, click the Call button provided on this web page. Our technical experts will provide assistance in resolving the problem.