Welcome to the often confusing and certainly dynamic world of SPF.
My company is also a publisher of SPF records, though it does not share
your particular environment.
If I understood your post, I think that your best recourse is to publish
DNS SPF TXT records that are IP Address based. As I understand the
process, minimally, an SPF aware SMTP server will note the incoming IP and
the FROM address of the message. From the FROM address, the SMTP server
can determine a domain. The server can then check the domain DNS TXT
records for a published SPF record from the domain holder. Given the IP
address syntax, you can control which IP addresses would be acceptable IP
sources for sending from that domain in SPF.
I hope that addresses your question.
Good luck.
Best,
Alan Maitland
The Commerce Company - Making Commerce Simple(sm)
http://WWW.Commerco.Com/
At 10:16 AM 12/30/2004, you wrote:
I am fairly new to SPF and I want to set my company up to start publishing
our SPF records. I am not sure what the best way to do this is. I have
many servers world wide that are hiding behind a firewalls. They are not
public machines, meaning no public DNS entries, but when I send out emails
from these servers, it appears that its coming from the external port on
the firewalls. So the header sees the IP correctly, but the server name
would be invalid (it shows my internal name, which doesnt resolve out on
the Internet). I am using the SPF wizard and want to know if I should skip
the hostname area and only add the IP addresses? Since the hostname will
never resolve, I am not sure how to proceed.
If you need more info, let me know.
TIA,
Nurv
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