What are best practices for handling email sending in PHP to avoid being flagged as spam by providers?

When sending emails in PHP, it's important to follow best practices to avoid being flagged as spam by email providers. This includes setting up proper email authentication (SPF, DKIM, and DMARC), using a reputable SMTP service, avoiding sending too many emails in a short period, providing a way for recipients to unsubscribe, and ensuring that your email content is not misleading or deceptive. 

// Example PHP code snippet for sending emails using a reputable SMTP service
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;

require 'vendor/autoload.php';

$mail = new PHPMailer(true);

try {
    $mail->isSMTP();
    $mail->Host = 'smtp.yoursmtpservice.com';
    $mail->SMTPAuth = true;
    $mail->Username = 'your_smtp_username';
    $mail->Password = 'your_smtp_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 'Message could not be sent. Mailer Error: ' . $mail->ErrorInfo;
}

Keywords

SMTP SPF DKIM DMARC email headers

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