In message <20050206215133.GH5839@chup.gado>, Denis Lagno writes:
>> >I have not much modifications from standard configuration in etc.tgz set.
>> >I have no /etc/hosts.deny file, I have not configured any firewall.
>> >I have almost unmodified sendmail.cf.
>> >Connection between machines is via Wi-Fi access point D-Link 2000AP+.
>> >Also there is configured ipsec, but I tried to disable ipsec and
>> >I still cannot telnet to port 25 from other machine.  But I can
>> >telnet to port 23 for example, or ssh.
>> 
>> What does "netstat -a | grep smtp" show?
>
># netstat -a | grep smtp
>tcp        0      0  localhost.smtp         *.*                    LISTEN
>tcp6       0      0  localhost.smtp         *.*                    LISTEN
>
Your sendmail is configured to listen to 127.0.0.1 only.  I don't run 
sendmail, so I can't tell you how to fix it, but I thought I saw a 
message last night with details.

Basically, NetBSD as shipped does not listen on *any* ports.  You need 
to reconfigure to listen for incoming connections from other machines.

		--Prof. Steven M. Bellovin, http://www.cs.columbia.edu/~smb