Do I need MX record at all?

[Barry Margolin]

In article <d443r0$scb$1 at sf1.isc.org>, unix at edify.com wrote:

> Hi
> 	I have read the DNS and BIND book and do understand the importance
> of a MX record. This weekend, I am making changes to the MX records with
> names and priority numbers. 
> 	
> 	I would like to know if MX record is needed at all reason is I am
> using Sendmail (8.12.11)on the same DNS server that uses mailertable which
> has entries to tell where it needs to pass on email. I have Checkpoint FW
> rules to tell how the email should be routed, so do I really need MX record
> for the outside world to tell where email should be delivered to. Below is
> my architecture.
> 
> Inbound email --> Checkpoint Firewall --> SMTP relay (in DMZ) running BIND
> and Sendmail --> Exchange (internal).
> 
> I will appreciate if someone clarifies this for me. TIA.

You need an MX record to tell the outside world that they should send 
mail for your domain to the Checkpoint firewall.  You probably don't 
need other MX records to relay from Checkpoint to sendmail and then to 
Exchange.

-- 
Barry Margolin, barmar at alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***