Email Server Locally Relay

gabriellai · #1 27th June 2005, 12:14 PM

Hi, I'm facing a problem where I want my email server to relay to each other.

I've 3 email servers, 1 is running on Linux Qmail, 2 are running on Sun Cobait email server.

3 server are running on same host name, and 2 of the Sun Cobait can talk with each other locally. This is setup because of 3 branches of same company, running at different country.

For Qmail, I'm not manage to link it up together to another 2 branches. we can send emails to qmail server, but qmail server cant email back to Sun Cobait email server....

How to enable QMAIL replaying locally, intranet.....?

Please advice

psb154 · #2 27th June 2005, 01:12 PM

gabriellai,

1. Can you telnet to each smtp server, from each smtp server?
telnet serverIP <port number>

2. Each of the smtp servers will need a separate port number if they are on the same computer. They can't all be 25 if they are on the same server.

3. If you are trying to use them via DNS, in a round robin fasion then each will require an MX record in you DNS zone files.

4. Have you checked your gateways? It could be that you have a simple resolution problem. From the qmail computer can you ping the Sun Cobait server? Can you telnet to the Cobait server from the qmail server? You could be missing a host name in the qmail's hosts file or the DNS that qmail references.

gabriellai · #3 27th June 2005, 01:37 PM

Hi,
is it I've to run Bind Server in Qmail email server with MX Record??

Services are running on separate pcs....
How can I know that something is missing in qmail's host file?? How can I point to DNS where qmail suppose to??

Please advice

psb154 · #4 27th June 2005, 01:50 PM

In order for each server to see the other servers they must be able to resolve each server's IP address with their host names.

If you are using a DNS server then that DNS server can be anywhere it does not have to be on the same computer as the smtp servers but it obviously has to be reachable by the servers that want to use its services.

Are all of the smtp servers in the same IP range. For example: 192.168.0.n ?

gabriellai · #5 27th June 2005, 01:53 PM

3 branches are connected through a lease line modem, and a router.... it's a 24hours connection.

Because of want to do local emailing, they link this up, and Sun email server is running well, but qmail with Mandrake is lost somewhere....

Make it easier, is qmail contain any relaying function??

3 branches are running on different subnet mask....

Gabriel

psb154 · #6 27th June 2005, 01:59 PM

From the qmail server, can you ping the other servers?

gabriellai · #7 27th June 2005, 02:03 PM

sure can ping,

problem is from Sun we can email to qmail server, but from qmail server, tries to email back to Sun email server, it failed...

Please advice

psb154 · #8 27th June 2005, 02:11 PM

can you telnet to Sun FROM the qmail server:
telnet suncomputer portnumber

You should get a response.

gabriellai · #9 27th June 2005, 02:18 PM

thanks, I will try it out later.....

will post back here if i have any news.....

psb154 · #10 27th June 2005, 02:23 PM

telnet sunServerName 25

gabriellai · #11 28th June 2005, 10:26 AM

Hello,
We can't telnet as it's being block by firewall.
Both Sun email serve are running on same subnet, but qmail server different subnet mask.
From QMail, able to ping to both 2 Sun email server..

The only problem is, how can I make the DNS relay on Mandrake Ver 10, Qmail is running on Ver 1.03

Please advice

psb154 · #12 28th June 2005, 10:51 AM

gabriellai,

If you can't telnet the Sun on port 25 from the Qmail server then nothing else is going to get through to the Sun on port 25 . You need to make a pin hole for port 25 in the firewall so that things can communicated on that port. Port 25 is the smtp communcation port.

Ping-ing tells us that the Sun ip address is alive and reachable from the Qmail server. The failure to telnet the Sun on port 25 tells us that a pin-hole needs to be made in your firewall to allow communication on port 25.

gabriellai · #13 28th June 2005, 01:48 PM

so is this is the qmail relaying issue with Sun email server??

Or I have to open port 25 for in and out?? Connection is lease line between branches.....

So, is email relaying an issue for this?? or the port 25 that blocks?

Please advice
Gabriel

psb154 · #14 28th June 2005, 02:42 PM

You said you had a firewall. Have you confirmed that the port is closed?

gabriellai · #15 28th June 2005, 02:44 PM

yup, the smtp port is being block by firewall....... So we can't telnet <serverip> smtpport