hi, I have installed Mailman-2.0.5, together with sendmail 8.9.3-20, in Redhat 6.2. everything works fine, execept when the mailing list deals with a group of hotmail users. when sending to the mailing list, there is no problem with non-hotmail users. however, sendmail delivers the message to hotmail users in a single attempt, and it always fails. the log messge looks like this: Jul 16 22:04:09 NAME sendmail[5069]: VAA05061: to=<[EMAIL PROTECTED]>,<[EMAIL PROTECTED]>,<[EMAIL PROTECTED]>,delay=00:13:02, xdelay=00:00:31, mailer=esmtp, relay=mc5.law5.hotmail.com. [64.4.56.199], stat=Service unavailable any one has a clue? thanks very much! jiang __________________________________________________ Do You Yahoo!? Get personalized email addresses from Yahoo! Mail http://personal.mail.yahoo.com/ ------------------------------------------------------ Mailman-Users maillist - [EMAIL PROTECTED] http://mail.python.org/mailman/listinfo/mailman-users