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On Tue, Jan 08, 2008 at 10:09:23AM -0800, Murray S. Kucherawy wrote:

> The use of the "SubDomains" option is intended to generate signatures for 
> arbitrary subdomains using a key advertised by the parent domain.  That is, 
> mail from "x.example.com" will be signed using "d=example.com".  It's 
> intended as blanket coverage for subdomains you may not know are in use.
>
> If that isn't what you want, then I believe you have more stringent 
> requirements than the DKIM subdomain signing concept supports, and you 
> should include "x.example.com" explicitly in your signing domains list (and 
> advertise a specific policy for it).

This particular clarification is something that is not inferred by the
documentation (at least not the man pages).  It might be worthy of adding
somewhere, even if it's just a * at the end of the relevant section,
because the docs don't make it clear that UseSubdomains tells
dkim-filter to not look up keys for the subdomain but instead only look
up the key for the parent domain.
- -- 
Regards...              Todd
Exponential problems need logarithmic solutions.         --Eddy Dreger
Linux kernel 2.6.22-14-generic   5 users,  load average: 1.04, 1.05, 1.04
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