What are some common pitfalls to avoid when sending bulk emails using PHP's mail() function?

One common pitfall to avoid when sending bulk emails using PHP's mail() function is sending all emails in a single loop, which can lead to performance issues and potential email delivery problems. To address this, you can batch the emails into smaller groups and send them in separate iterations to improve performance and ensure better deliverability. 

// Batch emails into groups of 100 recipients
$recipients = array_chunk($recipients, 100);

foreach ($recipients as $group) {
    foreach ($group as $email) {
        // Send email using mail() function
        mail($email, $subject, $message, $headers);
    }
}

Keywords

spam filters email headers SMTP email deliverability rate limiting

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