Postfix setup

[Tom Misilo]

The only linux machine on the network is a thinclient so I do not
think that will work? As it will think it is the "mail" server.

I tried from my schools server and cannot telnet in either? but could
that be because of the mynetworks line? and not having there range of
ips in it?

tcp        0      0 *:smtp                  *:*                     LISTEN
tcp        0      0 localhost:2207          *:*                     LISTEN
I found this using netstat so I figure it is running?

iptables is empty.

> I also have this in my main.cf
> mynetworks = 127.0.0.0./8 192.168.0.0/24 192.168.1.0/24 So any client
> that is on my network should be able to connect, no?
>
>         [ NB: 127.0.0.0./8 has one too many dots ]
>
>I would have thought so, yes.  Did you restart postfix after the last
>change to main.cf?
 >      sudo /etc/init.d/postfix restart


Ya I noticed the extra dot after I sent the email, and changed it.
Also I have restarted the service.


>1. You can connect and send mail on localhost port 25.
>   - Postfix is at least running on localhost
I can connect to port 25 on localhost from localhost, but sending mail
does not work using alpine.

>2. Although your mail server can't reach external mail servers to deliver.
>   - can you telnet to port 25 on remote mail servers from your server?
Nope I cannot telnet the gmail mail host that was said earlier.

>3. You can connect by name to port 25 from your mail server, but you get
> "relaying denied".  This should be fixed by the "mynetworks" line above.
>  - you should check that.
Works now using mail.misilo in the alpine config, but mail still does
not ever get out.

>4. You can't telnet to port 25 from remote windows machine.
>  - can you ping the server from the windows machine, by name and ip?
pinging by name works and so does pinging by ip
>  - what is is inet_interfaces set to in /etc/postfix/main.cf
inet_interfaces = all

>  - what is the output of "netstat --listening --tcp"
tcp        0      0 *:smtp                  *:*                     LISTEN
tcp        0      0 localhost:2207          *:*                     LISTEN

Don't think you want the whole thing?

Thanks!

Tom

On 8/14/07, Gavin McCullagh <gmccullagh at gmail.com> wrote:
> Hi,
>
> On Tue, 14 Aug 2007, Tom Misilo wrote:
>
> > This is the error I get back from telnet
> > C:\Documents and Settings\Administrator>telnet mail 25
> > Connecting To mail...Could not open connection to the host, on port
> > 25: Connect failed
>
> Do you have a linux machine you can connect from?  You should get a
> slightly clearer answer from it.
>
> Make sure you can ping mail from the windows machine and that you can ping
> it by its ip address as well as by name.
>
> On the server, you can run:
>
> gavinmc at boing:~$ netstat --listening --tcp
> Active Internet connections (only servers)
> Proto Recv-Q Send-Q Local Address           Foreign Address         State
> tcp        0      0 *:smtp                  *:*                     LISTEN
> tcp        0      0 localhost:2207          *:*                     LISTEN
>
> the two entries above imply that I have a program listening on the smtp
> port (ie tcp port 25) on all (*) interfaces and another listening on
> localhost (127.0.0.1) only on tcp port 2207.
>
> > Also to the best of my knowledge there is no firewall running.
>
> You should check this.  You can verify the server has no firewall rules
> with:
>
> gavinmc at boing:~$ sudo iptables --list
> Password:
> Chain INPUT (policy ACCEPT)
> target     prot opt source               destination
>
> Chain FORWARD (policy ACCEPT)
> target     prot opt source               destination
>
> Chain OUTPUT (policy ACCEPT)
> target     prot opt source               destination
>
> The output above is from a machine with no firewall rules set.
>
> > I also have this in my main.cf
> > mynetworks = 127.0.0.0./8 192.168.0.0/24 192.168.1.0/24 So any client
> > that is on my network should be able to connect, no?
>
>            [ NB: 127.0.0.0./8 has one too many dots ]
>
> I would have thought so, yes.  Did you restart postfix after the last
> change to main.cf?
>         sudo /etc/init.d/postfix restart
>
> 1. You can connect and send mail on localhost port 25.
>     - Postfix is at least running on localhost
>
> 2. Although your mail server can't reach external mail servers to deliver.
>     - can you telnet to port 25 on remote mail servers from your server?
>
> 3. You can connect by name to port 25 from your mail server, but you get
>    "relaying denied".  This should be fixed by the "mynetworks" line above.
>    - you should check that.
>
> 4. You can't telnet to port 25 from remote windows machine.
>    - can you ping the server from the windows machine, by name and ip?
>    - what is is inet_interfaces set to in /etc/postfix/main.cf
>    - what is the output of "netstat --listening --tcp"
>
> Gavin
>
>
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-- 
Tom Misilo
AIM:Tmisilo FL
Jabber:tmisilo at jabber.org
http://tmisilo.ath.cx