How can one ensure that emails sent from PHP scripts are not marked as spam?

To ensure that emails sent from PHP scripts are not marked as spam, you should set up proper email authentication, use a reputable email service provider, avoid sending bulk emails from shared hosting servers, and follow email best practices such as including an unsubscribe link. 

// Example PHP code snippet using PHPMailer to send authenticated emails through a reputable email service provider

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

require 'vendor/autoload.php';

$mail = new PHPMailer(true);

try {
    $mail->isSMTP();
    $mail->Host = 'smtp.your-email-provider.com';
    $mail->SMTPAuth = true;
    $mail->Username = 'your-email@example.com';
    $mail->Password = 'your-email-password';
    $mail->SMTPSecure = 'tls';
    $mail->Port = 587;

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

    $mail->isHTML(true);
    $mail->Subject = 'Subject of the Email';
    $mail->Body = 'This is the HTML message body';

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

Keywords

SPF DKIM DMARC email headers SMTP authentication

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