On Mon, 10 Mar 2008, Daryl C. W. O'Shea wrote:

On 10/03/2008 6:42 PM, John Hardin wrote:
This just squeaked past my SA:

  {snip}
  Date: Mon, 10 Mar 2008 17:38:53 -0400
  from: "greg martind" <[EMAIL PROTECTED]>
  Message-ID: <[EMAIL PROTECTED]>
  MIME-Version: 1.0
  subject: [SPAM] GOOD EMPLOYMENT OFFER
  to: [EMAIL PROTECTED]
  X-Authenticated: #46068547
  {snip}

The all-lowercase headers immediately caught my eye.

They're not uncommon in ham either, though.

See my followup - I was speaking of the header *names* being all lowercase, not their content. Sorry for not making that clearer in my initial post.

There doesn't appear to be a way to check for headers in a
case-sensitive manner short of a plugin or (maybe) a "full" rule. Am I
missing something?

After a quick troll through my corpus it looks like from, to and subject
headers all in lowercase might be a useful spam sign - if there was a
way to check them.

Do header checks with the ALL, ALL-UNTRUSTED or ALL-EXTERNAL headers.

Does that let you check the header names? Or just the content of headers regardless of their name?

--
 John Hardin KA7OHZ                    http://www.impsec.org/~jhardin/
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  and that's all.                                    -- Red Drag Diva
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