php mail function: Sending mails to BCC only

Question

the first param of php mail function is TO. Is there anyway to skip this parameter and use only CC/BCC to send bulk mails?

Thanks

Answer 1

An email message does not require a To header field. So you could pass null or a blank string for the to parameter, set up your own header containing the BCC header field and provide it with the fourth parameter additional_headers of mail:

$headerFields = array(
    'BCC: user1@example.com, user2@example.com, user3@example.com'
);
mail(null, $subject, $message, implode("
", $headerFields));