first question is about sendmail.  I cannot connect to it
from local network:

$ telnet flam 25             
Trying 192.168.0.11...
telnet: Unable to connect to remote host: Connection refused

I have not defined any packet filtering rules.
What should I change in sendmail.cf in order to be able to
connect from local network?


Second question is about sending mail.  I used to send mail
directly from localhost to destination mailer.  (This mail is sent
such a way).  But some mailers reject my mail as spam.
So I need to use some other mailer (for example free mailer)
as authenticating relay.  How can I do this?