|
When NAT is being used
In cases where NAT
(Network Address Translation) is being
used you will need to provide them with
the IP address of your external NAT
interface, and configure your NAT device
with Static Mapping for TCP Port 25, and
have all TCP Port 25 traffic forwarded
to the internal IP address of your mail
server.
Let's
say you have the following LAN
configuration:
Internet
|
|
|
|
|
192.90.1.1/29 (Real IP from ISP)
|
Internet Router + NAT
|
192.168.0.1 (Bogus IP)
|
|
|
|
|
Mail Server----------------Switching
Hub
192.168.0.10
|
(Bogus IP)
|
|
|
|
|
|
|
Rest of internal network
In the above example you
need to give the NAT's IP address as
your MX Record.
Domain name: dpetri.net
|
Record FQDN |
Record Type |
Record Value |
MX Pref |
|
mail.dpetri.net |
A |
192.90.1.1 |
|
|
dpetri.net |
MX |
mail.dpetri.net |
10 |
Note: Make sure
you properly configure the NAT device to
forward all TCP Port 25 traffic to
192.168.0.10. |
