I am a digest subscriber so I am getting the replies to my postings from the
mail archives web page.  Apologies for the resultant disjointedness.

This comment put me on the right track:

On: Mon, 02 Jun 2014 17:09:01 GMT, John Hardin <jhar...@impsec.org> wrote
> Your message headers are badly damaged, or there is a blank line
> at the beginning of the message as passed to SA.

I was copying the problem messages from Squirellmail's 'display message
details' option which I discover is not quite the same thing as copying the
original message file from the mail store.  However, getting messages from a
cyrus imap mail store housed on a remote server is not the easiest thing in
the world so I was hoping for a shortcut.  Ah well, live and learn.

So, now that I am passing the proper file format spamassassin -t is working as
I expected for the test messages I am generating.

However, returning to the original message that prompted this enquiry I have
pasted the original message headers extracted from the actual email message
file at:

http://pastebin.com/QitggvSS

This message had, as far as I can tell, a valid From: header and it passed
through Spamassassin via Amavisd directly from Postfix.  Nonetheless, it has a
MISSING_FROM tag.

Thank you for your assistance.  Any further help in explaining this situation
to me will is most welcome.

-- 
***          E-Mail is NOT a SECURE channel          ***
James B. Byrne                mailto:byrn...@harte-lyne.ca
Harte & Lyne Limited          http://www.harte-lyne.ca
9 Brockley Drive              vox: +1 905 561 1241
Hamilton, Ontario             fax: +1 905 561 0757
Canada  L8E 3C3


-- 
***          E-Mail is NOT a SECURE channel          ***
James B. Byrne                mailto:byrn...@harte-lyne.ca
Harte & Lyne Limited          http://www.harte-lyne.ca
9 Brockley Drive              vox: +1 905 561 1241
Hamilton, Ontario             fax: +1 905 561 0757
Canada  L8E 3C3

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