Why Am I Getting an Authentication Failure When Sending Emails via Gmail's SMTP Server from PHP?

Unable to Send Email via GMail's SMTP Server?

When attempting to send emails through GMail's SMTP server from a PHP page, you may encounter the error:

authentication failure [SMTP: SMTP server does no support authentication (code: 250, response: mx.google.com at your service, [98.117.99.235] SIZE 35651584 8BITMIME STARTTLS ENHANCEDSTATUSCODES PIPELINING)]

This error often arises when the PHP code lacks the correct SSL settings. Here's how to rectify the issue:

Corrected PHP Code:

<br>// Pear Mail Library<br>require_once "Mail.php";</p>
<p>$from = '<[email protected]>';<br>$to = '<[email protected]>';<br>$subject = 'Hi!';<br>$body = "Hi,nnHow are you?";</p>
<p>$headers = array(</p>
<pre class="brush:php;toolbar:false">'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>');

}

Key Differences:

• The host now includes ssl:// indicating a secure connection.
• The port is changed to 465, which is the standard SSL port.

By implementing these changes, you'll ensure proper SSL encryption and avoid the authentication failure error.

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