In the context of a newsletter or notification system, what are the considerations when sending emails to multiple recipients using PHP?

When sending emails to multiple recipients using PHP, it is important to consider the privacy and security of the recipients' email addresses. To prevent exposing all recipients' email addresses to each other, it is recommended to use the BCC (Blind Carbon Copy) field when sending the emails. 

$to = 'recipient1@example.com, recipient2@example.com';
$subject = 'Your Subject';
$message = 'Your Message';
$headers = 'From: your_email@example.com' . "\r\n" .
    'Bcc: hidden_recipient@example.com';

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

Keywords

PHP email multiple recipients SMTP mail function

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