Why Does My PHP Gmail SMTP Email Fail, and How Can I Fix the 'Authentication Failure' Error?

Sending Email via Gmail SMTP from PHP: Troubleshooting and Solution

When attempting to send an email through Gmail's SMTP server from a PHP page, an error may occur: "authentication failure [SMTP: SMTP server does no support authentication...]." This can be resolved by incorporating the following steps:

In the provided code, the error stemmed from using an outdated port number (587). For secure SMTP connections with Gmail, port 465 with SSL encryption should be employed.

To rectify the issue, update the SMTP server settings as follows:

With these modifications, the code will successfully connect to Gmail's SMTP server, allowing emails to be sent via the page.

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