POstfix not sending to a local exchange server

hawkpaul · 06-03-2003, 10:03 AM

Hello all.

I have a Postfix server running RedHat 9.0. It is sending and receiving email just fine to and from other email servers outside our intranet.

The problem is that I have another server running M$ exchange that I need to be able to send emails to as well. While I can receive mail from this server, I can't send mail to it.

Whenever I try and send mail to an email address that is hosted by this server the Linux box seems to have trouble knowing which of my servers is the email server. It is trying to connect on port 25 to the servers I have set up as the dns servers or to our web server.

I checked the mx record in my dns server and it is set up correctly.

Any thoughts?

Thanks

hawkpaul · 06-03-2003, 12:16 PM

By the way (I always forget this). My postfix version is 1.1.11

mcleodnine · 06-03-2003, 02:03 PM

Are there any error messages on either side of the smtp transaction (Postfix or Exchange)?

hawkpaul · 06-03-2003, 02:09 PM

Yes,

I tries to conect to one of the server that isn't the email server and the message it gives is

"Server dropped connection"

mcleodnine · 06-03-2003, 02:16 PM

Quote:

I tries to conect to one of the server that isn't the email server...

Erm... you're kind of losing me now. It's connecting to the wrong server?

hawkpaul · 06-03-2003, 03:26 PM

I know... it doesn't make sense.

What it says is
"Connecting to Server 10.36.2.18 on port 25 Server dropped connection"

Server 10.36.2.18 is my web server not my email server. It islike the postfix machine doesn't know which server is the email server.

I just tested that theory by setting postfix to relay all messages through the exchange server and it works fine.

The problem is I don't want it to relay through the exchange server.

Let me know if you need more clarification.

Paul

mcleodnine · 06-03-2003, 03:33 PM

mkay.. you want mail for local users to go to the Exchange server?

hawkpaul · 06-03-2003, 03:41 PM

Heres the deal...
I have two domains... a .edu and a .org

THe .edu domain's email is on the exchange server

The .org domain's email is on the postfix server.

I am able to send from the .edu to the .org but not the other way around.

I realize this is a bit convaluted. Sorry for the confusion

Paul

mcleodnine · 06-03-2003, 04:30 PM

Okay now I understand. Thanks.

when you do a 'dig domain.org MX' what do you get and where do you get the response from?

hawkpaul · 06-04-2003, 07:25 AM

Here is what I get I stuck "firstdomain" in for my domain and "mypdc" for our pdc:

[root@mail root]# dig firstdomain.edu MX

; <<>> DiG 9.2.1 <<>> firstdomain.edu MX
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 54805
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;montreat.edu. IN MX

;; AUTHORITY SECTION:
montreat.edu. 3600 IN SOA mypdc.firstdomain.edu. anadministrator.firstdomain.edu. 16782 600 600 86400 3600

;; Query time: 2 msec
;; SERVER: 10.36.2.12#53(10.36.2.12)
;; WHEN: Wed Jun 4 08:20:02 2003
;; MSG SIZE rcvd: 76

There you go with the names changed o protect the inocent. It not getting an answer. Can I set up a local MX record like a host file telling my linux server which server to contact when sending mail to firstdomain.edu?

Paul

Paul

hawkpaul · 06-04-2003, 07:54 AM

It is fixed.

The problem was the DNS record that was set up on the Windows 2000 machine. ARRGGHHHH!

I twas pointing to the domain as if it was a child domain. Thanks so much for your patience and help with this. It was so frustrating.

I thought things were set up correctly.

Mail is flowing well now.

Thanks for the help.

Paul