Why is my PHP email sent via Gmail's SMTP server failing, and how can I fix it using the Pear Mail library?

Sending Emails with GMail's SMTP Server from PHP

Issue:
When attempting to send an email using GMail's SMTP server from a PHP page, an error occurs, indicating authentication failure in SMTP.

Solution:

The provided code utilizes the Pear Mail Library, which requires adjustments for GMail's SMTP:

1. Set Protocol to SSL: Modify the host line to include 'ssl://' before 'smtp.gmail.com'.
2. Use Port 465 for SSL: Change the port number to '465'.
3. Ensure Correct Username and Password: Use the full email address as the username and the associated password.

Updated Code:

require_once "Mail.php";

$from = '';
$to = '';
$subject = 'Hi!';
$body = "Hi,\n\nHow are you?";

$headers = array(
    'From' => $from,
    'To' => $to,
    'Subject' => $subject
);

$smtp = Mail::factory('smtp', array(
        'host' => 'ssl://smtp.gmail.com',
        'port' => '465',
        'auth' => true,
        'username' => '[email protected]',
        'password' => 'passwordxxx'
    ));

$mail = $smtp->send($to, $headers, $body);

if (PEAR::isError($mail)) {
    echo('<p>' . $mail->getMessage() . '</p>');
} else {
    echo('<p>Message successfully sent!</p>');
}

By incorporating these changes, the code should now successfully send emails through GMail's SMTP server from the PHP page.

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