[SLUG] xxxx.lnk.telstra.net presented as connecting SMTP server

[Paul Forrester <paul@xxxxxxxxxxxxx>]

Hello all,

I have a server connected to the net via Telstra's internet direct
service.

My internet connection is an Alcatel ADSL Modem connected directly to
ethernet port on a Redhat 7.3 server.

Nothing special about the connection, just whipped up the standard ppp0
interface that comes with RedHat.

The allocated Static IP addresses I have aliased onto the NIC servicing
the modem.

The internal network is behind a standard "Morizot" IPTables
configuration.

I am running POSTFIX as the SMTP server.

My problem is when the SMTP server connects to another server, it is
connecting as xxxxxx.lnk.telstra.net and passing the B-end IP address,
not as mail.ausdex.com.au with the static assigned IP address.

So.. with current crop of anti-spamming techniques, the server I am
trying to connect to is failing to resolve the B-end back to the server
name.

Is there any additional service/s I should be running?

thanks
Paul Forrester
Mob: 0427 277 922
eMail: paul@xxxxxxxxxxxxx