I realise that this must be one of the most commonly asked questions on the net, but haven't found an answer despite extensive googling. I assume that my DNS is screwed.
I have set up a mail server using sendmail and debian 3.0. I am using an D-Link ADSL ethernet router, which acts as a name server. My outgoing messages don't get sent and I get this in the mail log (for a message to a hypothetcial recipient.com.au. My server has the name myserver.net.au - also hypothetical): Sep 8 18:04:36 debian sm-mta[3550]: i8883aUu003545: to=<[EMAIL PROTECTED]>, ctladdr=<[EMAIL PROTECTED]> (1000/1000), delay=0 0:00:40, xdelay=00:00:40, mailer=esmtp, pri=120440, relay=recipient.com.au., dsn=4.0.0, stat=Deferred: Name server: recipient.co m.au.: host name lookup failure My /etc/mail/sendmail.mc: divert(-1)dnl divert(0)dnl define(`_USE_ETC_MAIL_')dnl include(`/usr/share/sendmail/cf/m4/cf.m4')dnl VERSIONID(`$Id: sendmail.mc, v 8.12.3-6.6 2003-09-17 18:35:09 cowboy Exp $') OSTYPE(`debian')dnl DOMAIN(`debian-mta')dnl LOCAL_CONFIG FEATURE(`masquerade_envelope')dnl LOCAL_CONFIG Cwmydomain.net.au FEATURE(`use_cw_file')dnl FEATURE(`use_ct_file')dnl FEATURE(`smrsh')dnl LOCAL_CONFIG FEATURE(`access_db', hash -T<TMPF> /etc/mail/access)dnl FEATURE(`dnsbl', `sbl.spamhaus.org', `550 Mail rejected - your mail server is blacklisted: See http://www.spamhaus.org')dnl FEATURE(`dnsbl', `relays.ordb.org', `550 Mail rejected - your mail server is blacklisted: See http://www.ordb.org/faq/\#why_rejected')dnl FEATURE(`dnsbl', `list.dsbl.org', `550 Mail rejected - your mail server is blacklisted: See http://dsbl.org/main')dnl INPUT_MAIL_FILTER(`clmilter',`S=local:/var/run/clamav/clamav-milter.ctl,F=, T=S:4m;R:4m')dnl define(`confINPUT_MAIL_FILTERS', `clmilter')dnl define(`LOCAL_MAILER_PATH', `/usr/bin/procmail')dnl FEATURE(`local_procmail')dnl FEATURE(nodns)dnl MAILER_DEFINITIONS MAILER(`procmail')dnl MAILER(local)dnl MAILER(smtp)dnl My /etc/resolv.conf: domain mydomain.net.au nameserver 192.168.0.1 My /etc/hosts: ### etherconf DEBCONF AREA. DO NOT EDIT THIS AREA OR INSERT TEXT BEFORE IT. 127.0.0.1 localhost ::1 localhost ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes ff02::2 ip6-allrouters ff02::3 ip6-allhosts 192.168.0.33 debian.mydomain.net.au debian ### END OF DEBCONF AREA. PLACE YOUR EDITS BELOW; THEY WILL BE PRESERVED. Output of nslookup ozemail.com.au Server: 192.168.0.1 Address: 192.168.0.1#53 Non-authoritative answer: Name: ozemail.com.au -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]