On Wed, 7 Jan 2009, Murray S. Kucherawy wrote:
> The specific instance of this that has been observed is as follows:
>
> a) no use of "-C" on the command line
> b) no "On-*" directives in the configuration file (or no configuration file)
> c) a Sender: header with an address whose domain is in the list of domains
>   to sign
> d) no From: header on the message

Forgot one:

e) all other signing criteria are met (MTA name matches, macros match, 
source is on the "internal" list, etc.)

That is, one cannot craft a message from outside and send it inbound and 
expect the filter to crash, i.e. it's not exploitable from outside.

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