On Tue, Sep 06, 2005 at 11:09:38AM +0100, paddy wrote:
Indeed, an SPF record does help here.
don't understand.
If the server's IP addresses are 10.1.0.1, 10.2.0.2, 10.3.0.3, and
if each interface has a different name, this server could send out
mail using its primary name (for instance, the one belonging to
10.1.0.1) on any of its interfaces.
the spf record for example.org will be in the example.org zone file.
the ptr for an ip would be under different administrative control.
So? SPF works with the email domain, not with the interface names.
The email domain "example.org" has an SPF record:
example.org TXT "v=spf1 ip4:10.1.0.1 ip4:10.2.0.2 ip4:10.3.0.3 -all"
If you receive mail from "any(_at_)example(_dot_)org", this mail should come
from 10.1.0.1, 10.2.0.2 or 10.3.0.3 and nowhere else. You never
have to lookup a hostname (when using this record). All you do is
query DNS for the spf record belonging to "example.org" when you
receive the "MAIL FROM: <any(_at_)example(_dot_)org>" command.
Alex
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