Problem with SMTP SmartHost

[Knutern]

I have this rather exotic scenario to test:
[tt]
+---------------------+
| Internet |
|----------+----------+
|
|
+---------------------+
| ISA Server w. |
| SMTP Filtering |
|----------+----------+
|
| Bordernet
|
+---------------------+
| Router |
|----------+----------+
|
| Intranet[/tt]

This network design itself is not excotic. SMTP Filtering is configured and when external e-mails arrive at ISA Server they are checked and i not breaking any SMTP Filter rules, relayed to the internal mail server using DNS-Server.

The problem is, the customer want's to have the internal mail server use the ISA Server to send mails too.

I have set properties of the SMTP-Connector of the internal mail server to forward all mail through a smart host.

This works fine too.

But then my problems start:
[ul][li]is it true, that I have to define every domain on the Default SMTP Server Service, to which they are allowed to send e-mails? Because if i do not, I will get the error message that I am not allowed to relay to that domain specific domain.[/li]
[li]Also, I see no DNS lookup from the ISA Server when e-mails are sent outbound. Each domain defined under Default SMTP Server Service are set to use DNS. When I send from outside, i see DNS lookups to the internal DNS Server.[/li][/ul]
I might as well have overlooked something vital, but at this point, i do not see what....

Any one out there maybe?

Cheers
Knutern

 

[Knutern]

This problem is solved. Will create FAQ later.

Knutern