What are potential pitfalls to avoid when sending bulk emails using PHP?

Potential pitfalls to avoid when sending bulk emails using PHP include not properly handling errors, not setting up proper email authentication, and not optimizing the code for performance. To solve these issues, make sure to implement error handling, use SMTP authentication for sending emails, and optimize the code by using batch processing for sending emails. 

// Example of sending bulk emails with error handling, SMTP authentication, and batch processing

// Set up PHPMailer for sending emails with SMTP authentication
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;

require 'vendor/autoload.php';

$mail = new PHPMailer(true);

try {
    //Server settings
    $mail->isSMTP();
    $mail->Host = 'smtp.example.com';
    $mail->SMTPAuth = true;
    $mail->Username = 'your@example.com';
    $mail->Password = 'yourpassword';
    $mail->SMTPSecure = 'ssl';
    $mail->Port = 465;

    //Recipients
    $mail->setFrom('from@example.com', 'Your Name');
    $mail->addAddress('recipient1@example.com', 'Recipient Name');
    $mail->addAddress('recipient2@example.com', 'Recipient Name');

    //Content
    $mail->isHTML(true);
    $mail->Subject = 'Subject';
    $mail->Body    = 'Email body content';

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

Keywords

SMTP email headers spam filters rate limiting bounce handling

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