How can PHP be used to send emails to multiple addresses simultaneously, such as for a newsletter?

To send emails to multiple addresses simultaneously using PHP for a newsletter, you can utilize the `mail()` function in a loop to send individual emails to each recipient. Make sure to separate the email addresses with commas in the `to` field of the email headers. Additionally, you can use a mailing list or database to store and retrieve the email addresses. 

$recipients = array('email1@example.com', 'email2@example.com', 'email3@example.com');

$subject = 'Newsletter Subscription';
$message = 'Thank you for subscribing to our newsletter!';

foreach ($recipients as $recipient) {
    $headers = 'From: yourname@example.com' . "\r\n" .
               'Reply-To: yourname@example.com' . "\r\n" .
               'X-Mailer: PHP/' . phpversion();

    mail($recipient, $subject, $message, $headers);
}

Keywords

PHP email multiple addresses newsletter send emails

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