What potential pitfalls should I be aware of when sending mass emails using PHP?

One potential pitfall when sending mass emails using PHP is getting flagged as spam by email providers. To avoid this, make sure to set proper headers, such as the "From" header, and include an unsubscribe link in your emails. Additionally, consider using a third-party email service provider for sending mass emails to ensure deliverability. 

// Example code snippet for sending mass emails with proper headers and unsubscribe link
$to = 'recipient@example.com';
$subject = 'Your Subject Here';
$message = 'Your message content here. Please click <a href="unsubscribe.php">here</a> to unsubscribe.';
$headers = 'From: Your Name <yourname@example.com>' . "\r\n" .
    'Reply-To: yourname@example.com' . "\r\n" .
    'X-Mailer: PHP/' . phpversion();

mail($to, $subject, $message, $headers);

Keywords

SMTP email headers spam filters rate limiting bounce handling

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