What are common issues when sending newsletters to registered users in PHP?

One common issue when sending newsletters to registered users in PHP is that the emails may end up in spam folders due to improper email headers or content. To solve this, make sure to set appropriate email headers and include relevant content in the newsletter to avoid triggering spam filters. 

// Set appropriate email headers
$headers = "MIME-Version: 1.0" . "\r\n";
$headers .= "Content-type:text/html;charset=UTF-8" . "\r\n";

// Send newsletter to registered users
$users = getUsers(); // Function to retrieve registered users
$subject = "Newsletter";
$message = "Your newsletter content here";

foreach($users as $user) {
    mail($user['email'], $subject, $message, $headers);
}

Keywords

SMTP PHPMailer spam folder authentication bounce handling

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