Patrik Fältström wrote:
On Sep 14, 2004, at 08:57, Jim Lyon wrote:
On Monday, September 13, 2004 at 10:39 PM, Jonathan de Boyne-Pollard
said:
The DNS resolver APIs on all Microsoft OS's don't let you
query for an unknown record type.
Rubbish.
<http://msdn.microsoft.com./library/en-us/dns/dns/dnsquery.asp>
If you're behind a firewall and you call this API with an unknown record
type, it will fail with INVALID_PARAMETER.
What is the chance/risk you have some box behind a firewall, allow
incoming traffic using port 25/TCP but disallow the box to make outgoing
53/UDP+TCP connections?
I.e. yes, you are correct on this limitation, but, it will in reality be
possible for the box to send and receive DNS packets by itself IF it is
located so it accept incoming SMTP connections over the Internet. And I
claim enough boxes will be able to do that, and that a minority will
have the problem.
Microsoft is planning on deploying Sender-ID on the MUA level in Outlook
and Exchange. Either Jim or Harry mentioned before that they have a
working prototype that uses PRA to analyze email. In these cases, the
DNS traffic would still be blocked.
Yakov