Why is My PHPMailer Sending Emails Failing with \'Password Command Failed\' from a VPS?

PHPMailer - SMTP ERROR: Resolving Password Command Failure for Mail Delivery from a VPS Server

In this scenario, a developer encounters an issue while attempting to send emails from a shared server using PHP and PHPMailer. Despite following the correct PHPMailer syntax, the user faces the error "Password command failed", accompanied by "Please log in via your web browser and then try again."

To resolve this issue, it is essential to address the potential reasons behind the error. The problem likely stems from security measures implemented by Google, the provider of the SMTP server being used (Gmail). These measures can be triggered by the detection of "less secure" applications attempting to access the email account or by multiple login attempts in a short period.

To rectify the situation, the following steps can be taken:

1. Enable "Less Secure Apps":

   • Log into the Gmail account associated with the SMTP server.
   • Visit this link: https://www.google.com/settings/u/1/security/lesssecureapps
   • Toggle the option to "Allow less secure apps" to ON.

2. Disable Suspicious Activity Detection:

   • Log into the Gmail account and check for suspicious login attempts by accessing this link: https://security.google.com/settings/security/activity?hl=en&pli=1
   • If any suspicious activities are detected, review and accept them to allow the connection.

3. Clear CAPTCHA:

   • Access this link: https://accounts.google.com/b/0/DisplayUnlockCaptcha
   • Follow the instructions to clear the CAPTCHA, which may prevent successful authentication due to excessive login attempts.

By implementing these steps, the developer can resolve the "less secure" applications and suspicious activity issues and successfully send emails using PHPMailer from their VPS server.

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