What are common issues when using the mail() function in PHP to send bulk emails?

Common issues when using the mail() function in PHP to send bulk emails include server limitations on the number of emails that can be sent at once, emails being marked as spam by recipients' email providers, and slow performance when sending a large number of emails. To solve these issues, consider using a third-party email service provider like SendGrid or Amazon SES, which are designed for sending bulk emails and provide better deliverability rates. 

// Example of sending bulk emails using SendGrid API

require 'vendor/autoload.php'; // Include SendGrid library

$apiKey = 'YOUR_SENDGRID_API_KEY';
$email = new \SendGrid\Mail\Mail();
$email->setFrom("your@example.com", "Your Name");
$email->setSubject("Subject");
$email->addTo("recipient1@example.com", "Recipient 1");
$email->addTo("recipient2@example.com", "Recipient 2");
$email->addContent("text/plain", "Email content");

$sendgrid = new \SendGrid($apiKey);

try {
    $response = $sendgrid->send($email);
    echo "Emails sent successfully!";
} catch (Exception $e) {
    echo 'Caught exception: ' . $e->getMessage() . "\n";
}

Keywords

mail() bulk emails SMTP spam folder rate limiting

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