Re: Mail server and iptables/exim

[David P James]

Stephen Gran was roused into action on 2003-01-09 18:23 and wrote:

This one time, at band camp, David P James said:

I've been trying to setup my Debian Woody network server as a mail server as well.

At present I can send email to an account on that server from *within* the lan using the server's internet domain name (davidium.dyndns.org) in the email address, but not from outside (the connection times out, according to the Failed Mail Delivery messages I get 4 hours later). This may be iptables or it may be exim; I'm not sure. The email was sent using exim on my own Debian box within the lan; specifing an external smtp server results in a failed delivery however.

I'm using the ipmasq package that comes with Debian Woody, and I can at present access other server functions from the outside such as http and ftp, so I'm leaning towards a problem in exim.conf but as I said I'm really not sure as I can't see anything amongst the exim.conf options that should account for this.

As you have noted, there are quite a few variables.  Rule out iptables
and tcpwrappers first - from an address outside the LAN, telnet
your.host.ip 25 - if the connection times out, it's probably iptables,
if it's refused, it's either iptables or tcpwrappers.  If you connect
and get the exim greeting banner, then you know that the problem is your
exim.conf.

I sshed to my brother's Redhat server and did the telnet my.host.ip 25 thing back to my server; the connection timed out. I tried a few other ports (21, 80, 22, 110) and got a connection quite quickly.


--
David P. James
4th Year Economics Student
Queen's University
Kingston, Ontario
http://members.rogers.com/dpjames/

The bureaucratic mentality is the only constant in the universe.
-Dr. Leonard McCoy, Star Trek IV


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