cannot telnet port 25 from other hosts

Giovanni Riganti admin.linux at
Wed Jul 28 15:05:08 UTC 2004

Alle 16:27, mercoledì 28 luglio 2004, ssoss S ha scritto:
> hi..  I found that I cannot telnet my linux box (fedora core1) via port 25
> (SMTP) but the SMTP service is started.  I can telnet to localhost via port
> 25.  May I know where is the config to control and allow me to telnet
> mylinux 25 from other hosts??
> FYI, my sendmail version is
> [root at watcher root]# telnet localhost 25
> Trying
> Connected to localhost.
> Escape character is '^]'.
> 220 ESMTP Sendmail 8.12.10/8.12.10; Wed, 28 Jul 2004
> 22:19:17
> +0800


By default, the Sendmail mail transport agent (MTA) does not accept network 
connections from any host other than the local computer. If you want to 
configure Sendmail as a server for other clients, you must edit 
/etc/mail/ and change the DAEMON_OPTIONS line to also listen on 
network devices (or comment out this option entirely using the dnl comment 
delimiter). You must then regenerate /etc/mail/ by running the 
following command (as root):

      make -C /etc/mail

      Note that you must have the sendmail-cf package installed for this to 


 17:01:15  up 62 days,  1:48,  4 users

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