"Jason R. Mastaler" <[EMAIL PROTECTED]> writes:

>>      To: [EMAIL PROTECTED]
>>      From: [EMAIL PROTECTED]
>>      References: <[EMAIL PROTECTED]>
>
> The question is, will they do this?

Another question is, even if they had incentive to do this, what
algorithm would the spammer use to generate a References header
that would slide past my TMDA?

I can force my Message-IDs to contain any string I choose. Today it
might be 'yin.mid.mastaler.com'. e.g,

Message-ID: <[EMAIL PROTECTED]>

So I can allow only MIDs which contain '@yin.mid.mastaler.com>'.  
If the spammer starts using this string, I can easily switch to
'yang.mid.mastaler.com'.
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