I came across a nice howto page this weekend for WBEL, giving a step-by-step configuration guide for new installations, including Postfix with SMTP-AUTH and TLS, two features that have kept me stuck in Sendmail for too long. I also didn't know about rdate before reading this site. I thought I'd pass it along here: http://www.falkotimme.com/howtos/perfect_setup_whitebox/index.php