randall wrote:
> Kilian wrote:
>>
>> I have a firewall with a public IP and a PTR record for that IP. There
>> are several hosts behind the firewall with private IP addresses.
>
> i have the same, but i have setup one of them to relay the mails for all
> of them, not sure about your setup but this would simplify your problem
> a lot.
Hehe, this is exactly what I had before, but one server sends out a lot
of periodic mailings (legitimate! beware ;-) and it simply overloaded
the smarthost, which is the main mailserver. So the mailing had an
impact on the users on the main mailserver, which was not acceptable, so
I decided the server on which the mailing script runs should send out
the mails directly.
[...]
>> Now to the receiver SMTP, my host appears as the firewall, so IMHO, it
>> must identify itself with the hostname set in the DNS for the firewall.
>
> correct, but note that that it has to identify with the hostname of your
> "reverse" DNS, it took me a while before i understood this concept myself.
Yes, that I am aware of and that is what I am trying to accomplish.
>>> if both HELO and the PTR record say mail.server.com there is no problem,
>>> whatever the domain of the send mail might be.
>>>
>> Exactly, and herein lies my problem...
>
> maybe i mist something, but what does is it precisely use as its
> hostname at this very moment?
In the HELO sequence, it's using the hostname from the DNS inside the
DMZ which is of course not identical to the PTR-RR of the firewall on
the internet...
-- Kilian
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