SMTp Port Enable

rednex269 · 12-04-2002, 09:34 PM

I wanna enable my SMTP Port.. However, it is currently only open to the localhost... I do not have any of the firewall installed..

Suggestions?

JS

neo77777 · 12-04-2002, 10:14 PM

It is either mail isn't listening for connections originated from other than localhost, or believe it or not there is a firewall running.
Here is the rule to open it up

Code:

$IPTABLES -A INPUT -i $EXTIF -m state --state NEW,ESTABLISHED,RELATED -p tcp -s $UNIVERSE -d $EXTIP --dport 25 -j ACCEPT

Where is $IPTABLES=/path/to/iptables, $EXTIF=external interface such as eth0 and $UNIVERSE=0.0.0.0/0, and $EXTIP=your IP

unSpawn · 12-05-2002, 02:50 AM

and if mail is listening for connections originated from none other than localhost check your sendmail.cw for "DAEMON_OPTIONS" directive, it'll prolly read something like:
DAEMON_OPTIONS(`Port=smtp, Addr=127.0.0.1, Name=MTA')
comment the line out pre and postfixing "dnl" (the m4 way for comments) and add another line
dnl DAEMON_OPTIONS(`Port=smtp, Addr=127.0.0.1, Name=MTA')dnl
DAEMON_OPTIONS(`Port=smtp, Addr=<your public IP address>, Name=MTA')
Save a copy of your /etc/sendmail.cf and rebuild your sendmail.cf with "m4 /etc/mail/sendmail.mc > /etc/sendmail.cf" or if you use Linuxconf do "mailconf --generatecf". Then restart sendmail.

Please read your sendmail docs first on how to *not* let your MTA function as relay for spammers. If you're system is connected to any untrusted network then set up a firewall. It isn't hard (we've got lotsa threads about it).