[afnog] IIS & DNS

[Mark Tinka]

Hi all. This is mostly meant for the M$ experts:

I have a customer that is running IIS, and uses it to send 
e-mail via DNS lookup.

The customer says IIS makes DNS queries on TCP port 53; 
our internal security policy suggests that, by default, 
we reserve TCP port 53 on our name servers for internal 
zone transfers.

I have no clue on how IIS makes DNS queries. Would 
appreciate any insight.

Cheers,

Mark.
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