Why is My SwiftMailer Script Failing to Send Emails via Gmail?

Using PHP's SwiftMailer to Send Emails via Gmail

This question arose when attempting to use SwiftMailer with a Gmail account to send an email to itself. Modifications were made to the script based on SwiftMailer's reference, but no results were obtained.

The issue stemmed from the line:

<code class="php">$result = $mailer->send($message);</code>

This line caused the code to fail, indicating an issue with sending the message. It is possible that the message was not being sent and the program crashed as a result.

The script code was as follows:

<code class="php">require_once '/var/www/swift/lib/swift_required.php';
echo 'Mail sent <br />';

$transport = Swift_SmtpTransport::newInstance('smtp.gmail.com', 587)
  ->setUsername('example@gmail.com')
  ->setPassword('password');

echo 'line 40 <br />';
$mailer = Swift_Mailer::newInstance($transport);
$message = Swift_Message::newInstance('Wonderful Subject')
  ->setFrom(array('example@gmail.com' => 'Evaluaciones'))
  ->setTo(array('example@gmail.com' => 'A name'))
  ->setBody('Test Message Body');

echo 'line 52 <br />';
$result = $mailer->send($message);
echo $result;
echo 'line 58 <br />';</code>

To resolve this issue, the code was modified as follows:

<code class="php">$transporter = Swift_SmtpTransport::newInstance('smtp.gmail.com', 465, 'ssl')
  ->setUsername($this->username)
  ->setPassword($this->password);

$this->mailer = Swift_Mailer::newInstance($transporter);</code>

This resolved the issue, allowing the message to be sent successfully.

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