Ok, sorry Camilo: I misunderstood you question.
Anyway I don't think you can do this directly inside OTRS.
I'm not that DNS expert,  but maybe is possible to filter MX DNS nslookups (q=mx) coming from a specified IP address (the one of your OTRS server) redirecting them to an outside DNS server.
 
Ciao, d.

Da: otrs-bounces@otrs.org [mailto:otrs-bounces@otrs.org] Per conto di Camilo Vieira
Inviato: giovedì 17 luglio 2008 15.21
A: User questions and discussions about OTRS.org
Oggetto: Re: [otrs] R: How to set DNS server in OTRS?

Daniele,

 

I intend to configure the DNS Servers to enforce the OTRS make MX nslookups in outside DNS servers of my LAN.

 

 

Camilo Vieira • Infra-estrutura de redes • 55 11 7643-4895
Navita • Portais e BlackBerry • 55 11 3897-3797

 

From: otrs-bounces@otrs.org [mailto:otrs-bounces@otrs.org] On Behalf Of CARNINO Daniele
Sent: quinta-feira, 17 de julho de 2008 04:42
To: User questions and discussions about OTRS.org
Subject: [otrs] R: How to set DNS server in OTRS?

 

Why someone should set DNS in OTRS?
OTRS is a ticketing system, not an Operating System: of course it uses the DNS defined on the underlying OS.

Da: otrs-bounces@otrs.org [mailto:otrs-bounces@otrs.org] Per conto di Camilo Vieira
Inviato: mercoledì 16 luglio 2008 23.18
A: otrs@otrs.org
Oggetto: [otrs] How to set DNS server in OTRS?

Hi,

 

I was just wondering if somebody to know how to set DNS servers within OTRS.

 

Thanks.

 

Camilo Vieira • Infra-estrutura de redes • 55 11 7643-4895
Navita • Portais e BlackBerry • 55 11 3897-3797