Issues with Mail (SMTP) and Mime_Mail

Hello, i'm currently modifying an online mailing tool so that it uses the Mime Mail and Mail packages. Before the changes, i was sending the emails using PHP's mail function, and everything was going fine. Now that i'm using Mail::factory('smtp'), i run into big issues, and i need to know if i'm doing something wrong before i start editing the whole package :) First weird thing, not all the emails are sent; I have in my list like 3500 addresses, and it stops after 500 or 600 messages sent. The browser keeps on loading during a few minutes, then displays a blank page, and a DNS error a bit later. I can see in exim's log that the send process is not stopped. Only a few minutes later, it stops. Of course, there is no time limit on the script that sends the emails... Second one, most messages are sent twice ! Once, then another time at about 5 - 6 minutes later. When i run a test with a small amount of recipients, there are absolutely no errors, and the messages are only sent once. Do you think that the error(s) could come from the smtp server ? If the answer is yes, then what can i do ? Thanks in advance, -- Katana mailto:katana@katana-inc.com Addon: Here is the part of my code that sends the emails. $headers = array( 'From' => $from = stripslashes(trim($_POST['mailsender_name'])), 'Reply-To' => $from, 'Return-path' => $from, 'Return-Errors-To' => $from, 'X-Mailer' => sprintf('Interact HTMLMailer v%s', $version), 'Subject' => sprintf('[Interact Mailing Lists Manager] %s', stripslashes(trim($_POST['mail_subject']))), 'To' => $to ); // Send the confirmation email to the the user $body = $mime->get(); $hdrs = $mime->headers($headers); $mail =& Mail::factory('smtp', array('host' => 'localhost')); $res = $mail->send($to, $hdrs, $body); unset($mime->_headers); // Send the mailing to every recipient of the mailing list $headers['Subject'] = $_POST['mail_subject']; $mailsSent = 0; $errors = 0; foreach($emailsdest as $emaildest) { $headers['To'] = $emaildest['email']; $body = $mime->get(); $hdrs = $mime->headers($headers); if ($res = $mail->send($emaildest['email'], $hdrs, $body)) { $mailsSent++; } else { $errors++; } unset($mime->_headers, $hdrs); }