What are common reasons for the error message "Expected response code 250 but got code "", with message "" in ./__swift/thirdparty/SwiftMailer/classes/SwiftMailer/Transport/AbstractSmtpTransport.php:386" in PHP?

This error message typically occurs when there is an issue with the SMTP server response during email sending using Swift Mailer in PHP. It could be due to misconfiguration of the SMTP server settings, network connectivity problems, or server-side issues. To solve this problem, you should check and ensure that the SMTP server settings are correct, the server is reachable, and there are no firewall restrictions blocking the connection. 

// Example code snippet to set up Swift Mailer with correct SMTP server settings
$transport = new Swift_SmtpTransport('smtp.example.com', 587, 'tls');
$transport->setUsername('your_smtp_username');
$transport->setPassword('your_smtp_password');

$mailer = new Swift_Mailer($transport);

// Create and send the message
$message = (new Swift_Message('Subject'))
    ->setFrom(['your@example.com' => 'Your Name'])
    ->setTo(['recipient@example.com' => 'Recipient Name'])
    ->setBody('Message body');

$result = $mailer->send($message);

if ($result) {
    echo 'Email sent successfully.';
} else {
    echo 'Failed to send email.';
}

Keywords

response code 250 error message SwiftMailer AbstractSmtpTransport PHP

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