I'm running Mandriva 2007.1 (Spring Free) I tried to check postifx with the telnet command telnet localhost 25 and it connected with no issues. However, when I run ehlo localhost, I get nothing.
Any errors in your mail log? What's the output of Code: postconf -n ? What's the output of Code: hostname -f ? What's in /etc/hosts and /etc/resolv.conf?
I went back and looked at the postconf listing and found one entry missing and one that was wrong. Once I'd put them in, ehlo ran as expected. Thanks again.