issue with DNS and I kindly need help from you all

[golpemortal]

I spent the entire weekend trying to solve this and yet still working on it!!!

I just got my server from fedex
moved everything from old to new with Centos 5.1


ok here is an idea of what I have..

DSL line come in to my modem from modem goes to my router,
my router forwards traffict to my main server 192.168.123.2
apache Worked!!!
all domains that I host works OK
DNS is running at 192.168.123.2 which is my main server...
Now
on my other server 192.168.123.1 is my Email server Running postfix
on my router is set to forward smtp/POP
well, I can not reaching my email server with any client email softwares..

my dns is only has master since I think my router will direct traffict to those ports...

or am I wrong :-0 ?


on my /etc/hosts.
127.0.0.1 localhost.localdomain localhost
192.168.123.2 ns2.example.com ns2
::1 localhost6.localdomain6 localhost6


on my /etc/resolv.conf

; generated by /sbin/dhclient-script
search 192.168.123.254 # Router gateway
nameserver 192.168.123.2 # main server

with this setup seems to works fine excepts my email server...

and Honestly I never done any other setup where I run many services from different machine, I always done it withing one single system and since
I want take some of the load from the old server I decited to other new one and got stuck on email srver....

hope you guys can help me...

[asidu]

1 First ensure that you are able to ping to the 192.168.123.1 from your other machines ?

2 Check if there is any IPtables/fierwall running on the 192.168.123.1 machines.

[golpemortal]

because I kept messing with DNS and not giving enough time to spread to all the networks... stopped for few hrs and boom!!! started to work....

I should it known better!!!


one more question

How can I authenticate a user who is, for this example in NY and my server is in California he needs to connect to my server to send mail....

How can I authenticate him ?

Currently I'm using

Centos 5.1
MailScanner
Courrier-imap
ClamAV
Spamassassin
Postfix
postfixadmin
phpadmin
mysql