I followed the ubuntu manual, but I actually have the Debian 4.0. At some point during installing and configuring, my mail was delivered, but some later phase of conf killed it. I've been searching for solutions for 2 weeks now and I ran out of ideas. I keep getting the same fatal error in my log: Code: Jun 10 15:09:22 server postfix/smtpd: warning: dict_nis_init: NIS domain name not set - NIS lookups disabled Jun 10 15:09:23 server postfix/smtpd: fatal: unexpected command-line argument: ??o Jun 10 15:09:24 server postfix/master: warning: process /usr/lib/postfix/smtpd pid 20120 exit status 1 Jun 10 15:09:24 server postfix/master: warning: /usr/lib/postfix/smtpd: bad command startup -- throttling Jun 10 15:09:24 server amavis: (20084-01) (!) FWD via SMTP: <email@example.com> -> <firstname.lastname@example.org>, 450 4.4.1 Can't connect to 127.0.0.1 port 10025, (Bad file descriptor) at (eval 42) line 145, <GEN25> line 127., MTA([127.0.0.1]:10025), id=20084-01 I don't have any more ideas of how to find where this fatal error comes from. Could anybody please suggest some ways to find the problem.