I'm running RedHat 5.2, with libc-5.3.12-28. I'm having problems with sendmail. I used /bin/mail to try to send messages to "jari_aalto". Whenever sendmail processes the queue, it logs messages like: Dec 7 20:06:05 orbit sendmail[13764]: My unqualified \ host name (orbit) unknown; sleeping for retry Dec 7 20:07:05 orbit sendmail[13764]: unable to qualify \ my own domain name (orbit) -- using short name I'm using the stock sendmail.cf. Other files that might be of interest are: /etc/hosts: 127.0.0.1 loopback 0.0.0.0 orbit /etc/resolv.conf: domain trytel.com nameserver 209.167.55.5 nameserver 209.167.55.15 nameserver 207.112.63.4 /etc/nsswitch.conf: (changed lines ONLY) passwd: files shadow: files group: files hosts: files dns I'm using PPP to connect to two ISPs (and plan to add a third soon). They are "trytel.com" (my primary ISP) and "wonder.ca". Because I'm connecting to two, I hesitate to define either one in the $j macro in sendmail.cf or to specify a smart mail host with DS. How can I get sendmail to send mail?
I cannot really tell from the information that you provided, but the IP address for orbit (0.0.0.0) is what is causing your problem. This is not a valid IP address for a machine. You might want to check with your ISP to verify that you are using a valid address for orbit.