hi, there are a MTA Evaluation on delivery performance at http://www.kyoto.wide.ad.jp/mta/eval1/eindex.html bulk_mailer-1.11 with sendmail-8.9.3 exim-2.053 postfix beta-19990122-pl01 (formerly called vmailer) qmail-1.03 sendmail-8.9.3 Smail-3.2.0.101 SMTPfeed-0.95 with sendmail-8.9.3+3.2W zmailer-2.99.50s11 regards,