What potential issues can arise when using PHP to send bulk emails, such as newsletters to a large number of recipients?

One potential issue when sending bulk emails with PHP is that it can overwhelm the server resources and lead to slow performance or even server crashes. To solve this, you can use a third-party email service provider like SendGrid or Amazon SES to handle the email delivery, as they are specifically designed for sending large volumes of emails efficiently. 

// Example of sending bulk emails using SendGrid
require 'vendor/autoload.php'; // Include the SendGrid library

$email = new \SendGrid\Mail\Mail();
$email->setFrom("your@example.com", "Your Name");
$email->setSubject("Subject of the email");

$recipients = ["recipient1@example.com", "recipient2@example.com", "recipient3@example.com"];

foreach ($recipients as $recipient) {
    $email->addTo($recipient);
}

$email->addContent("text/plain", "Body of the email");

$sendgrid = new \SendGrid('SENDGRID_API_KEY');
$sendgrid->send($email);

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