Gmail SMTP Error 5.5.1: How Can I Fix Authentication Issues?

Gmail identity verification error: error 5.5.1

When sending emails with SMTP, the user may encounter an error: "The SMTP server needs to be connected safely, or the client is not verified by identity. The server response is: 5.5.1 requires identity verification." This error is usually due to Google The identity verification problem or security measures implemented.

Reason:

Password error

access from third -party applications

• Login attempts from different time zones/domain/equipment
Solution:

Situation 1: Password error

Make sure the password entered in the code is correct.

Situation 2: Third -party application access

Solution 1:

from https://www.php.cn/link/0A8A64171A9145F6A47E5B3544632E3B

Enable low security applications.

• Solution 2:
  • Enable two -step verification and verify for SMTP authentication to generate a password specific to the application.

• Situation 3: Log in from different time zones/domain/equipment

  • Solution 1:

Check the Google account event. However, due to security restrictions, this may not be reliable.

Solution 2:
• (If you have the right to access the production server, you can use this method)

  Log in from the production server browser to add an exception.

  Solution 3:

• Visit https://www.php.cn/link/22cd4d66fc24fc0163ac00d27C1433C5 and click "Continue" to enable login from other time zones/IP.

  This should be able to solve the problem of authentication and allow you to use the Gmail account to send email via SMTP.

The above is the detailed content of Gmail SMTP Error 5.5.1: How Can I Fix Authentication Issues?. For more information, please follow other related articles on the PHP Chinese website!