Why Does My Server Get an \'SMTP Password Command Failed\' Error When Sending Emails via Gmail?

SMTP Error: Password Command Failed When Sending Email from Server

Problem:

Despite using the correct PHPMailer settings and GMail credentials, an error occurs when attempting to send email from a shared server. The error message reads: "SMTP connect() failed" with a 534 response indicating that the password command has failed.

Solution:

Contrary to the assumption that the PHP script is error-free, the issue lies in Google's security measures. When an application attempts to access a GMail account, Google may flag it as potentially suspicious due to:

• Less secure applications: GMail may restrict access to certain applications or devices that lack strong security protocols.
• Multiple login attempts: Frequent logins in a short period may trigger a security alert.
• Changing countries or IP addresses: Using VPN or accessing the account from different locations can also raise suspicions.

Resolution:

To resolve this issue, the following steps are recommended:

1. Enable Less Secure Apps: Visit the GMail settings page (security.google.com/settings/security/activity) and ensure that "Allow less secure apps" is enabled.
2. Clear Captcha: Access the Google account's login page (accounts.google.com/DisplayUnlockCaptcha) and click "Continue" to remove any captcha challenges.
3. Disable Suspicious Apps: In the GMail settings (security.google.com/settings/security/activity), review recent access attempts and authorize any suspicious activity.

By completing these steps, the security measures implemented by Google will be bypassed. However, it's worth noting that using less secure applications may affect the security of the email account, so it's prudent to weigh the risks and benefits before enabling them.

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