PHPmailer.. best way to send to many recipients?

Hi everyone, I just started using PHPmailer for one project that requires SMTP authentication (if I said that right).. and all is well.. but I want to ask now before it might get outta hand later: How many comma-delim'ed addresses can I stuff in $BCC_recipients before I have problems (need to restructure the design)? ------------------------------------------------------ require("php_inc/class.phpmailer.php"); $mail = new PHPMailer(); $BCC_recipients = "xxxx@host.com,yyyy@server.com"; // <---just an example $arrBCC_recipients = explode(",", $BCC_recipients); foreach ($arrBCC_recipients as $email2stuffInBCC) { $mail->AddBcc($email2stuffInBCC); } if(!$mail->Send()) { // problem .... ------------------------------------------------------ For now there will be less than 100 Bcc recipients.. but later, more. I don't know if/when it will ever grow past 1,000. ------------ Govinda