The limit isn't with the class itself, but rather the external elements that are affected. Some sending mail servers simply won't accept large to lists, and as you already found, waiting for that many confirmations can cause the script to time out.

If you need to send it, and your server supports it, I'd just set the timeout higher. Perhaps to 0 if you're sure the script is safe.

Do I have to set this timeout in the ini file?

It depends on your server config. If apache allows it, set_time_limit() should also work.

I personally found that if I send more than a couple hundred emails at once, I just have to use an Email Relay service. GMail will block you after a couple hundred emails a day.

I use DNSExit.com, they're cheap and pretty reliable. And their DNS relay is perfectly compatible with QEmailServer.

Thanks Alex, I'm checking out DNSExit.com.
I'd appreciate if you give me a sample code on how you have been using them. I've clicked on mail outbound .... and I'm checking them out now!

QEmailServer::$SmtpServer = 'relay.dnsexit.com';
QEmailServer::$SmtpPort = 26;
QEmailServer::$AuthLogin = true;
QEmailServer::$SmtpUsername = "...";
QEmailServer::$SmtpPassword = "...";

$msg = new QEmailMessage();
$msg->From = ...;
$msg->Subject = ...;
$msg->To = ...;

set_error_handler("EmailSendHandler");
try {
QEmailServer::Send($msg);
} catch (Exception $ex) {
....
}
restore_error_handler();

function EmailSendHandler($__exc_errno, $__exc_errstr, $__exc_errfile, $__exc_errline) {
throw new Exception($__exc_errstr);
}