How can PHP developers ensure that their email-based confirmation links are not flagged as spam by email providers?

Email providers often flag confirmation links sent by PHP scripts as spam due to various reasons like improper formatting or lack of authentication. To ensure that these emails are not marked as spam, PHP developers should use SMTP authentication to send emails, include a valid sender email address, set proper email headers, and use a reliable email service provider. 

// Example PHP code snippet using PHPMailer to send email with SMTP authentication

use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;

require 'vendor/autoload.php'; // Include PHPMailer library

// Create a new PHPMailer instance
$mail = new PHPMailer(true);

try {
    // Server settings
    $mail->isSMTP();
    $mail->Host = 'smtp.example.com';
    $mail->SMTPAuth = true;
    $mail->Username = 'your@example.com';
    $mail->Password = 'your_password';
    $mail->SMTPSecure = 'tls';
    $mail->Port = 587;

    // Sender and recipient settings
    $mail->setFrom('your@example.com', 'Your Name');
    $mail->addAddress('recipient@example.com', 'Recipient Name');

    // Email content
    $mail->isHTML(true);
    $mail->Subject = 'Confirmation Email';
    $mail->Body = 'Click the link to confirm your email: <a href="https://example.com/confirm.php?token=12345">Confirm Email</a>';

    // Send the email
    $mail->send();
    echo 'Email sent successfully';
} catch (Exception $e) {
    echo 'Email could not be sent. Mailer Error: ' . $mail->ErrorInfo;
}

Keywords

PHP email confirmation spam email providers deliverability

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