


Why Am I Getting the Gmail SMTP Authentication Error '5.5.1 Authentication Required'?
Jan 30, 2025 am 11:11 AM
When sending an email, the error "SMTP server requires a safe connection or the client is not authenticated by identity. The server response is: 5.5.1 identity verification required" may have a variety of factors.
Reason 1: Password error
Make sure the password provided by the sending address is correct.
Reason 2: Log in from a third -party application
If you log in from applications other than standard Gmail, you may encounter this error.
Solution: Enable the application with low security
Visit
- Enable application options that allow lower security.
- Reason 3: Geographical restrictions
- If you try to log in from the time zone or computer you usually use, Google may mark it as a suspicious event.
Solution 1: Log in from the production server
If you have the right to access the production server, build a remote desktop connection and log in from the browser of the server. This will create an exception and allow login from code.Solution 2: Enable access from abnormal positions
If you have no right to access the production server, visit
http://www.miracleart.cn/link/22CD4D66FC24FC0163AC00D27C1433C5and grant the permissions logged in from other positions.
Solution 3: Create a password specific to the application
Enable the two -factor authentication and generate a password specific to the application (http://www.miracleart.cn/link/5165bb7092845d88fd8FD52D1F32B5 SMTP.
The above is the detailed content of Why Am I Getting the Gmail SMTP Authentication Error '5.5.1 Authentication Required'?. For more information, please follow other related articles on the PHP Chinese website!

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