https://issues.apache.org/SpamAssassin/show_bug.cgi?id=6417

--- Comment #10 from John Wilcock <[email protected]> 2010-07-06 10:38:05 EDT ---
I haven't seen any FPs since the change, though we get very little genuine mail
from Microsoft.

However, Michael's proposed && (SPF_SOFTFAIL | SPF_FAIL) would miss much of the
spam that I suspect this rule was originally designed to hit. Spam with
subjects such as the following, purportedly from domains owned by Microsoft but
with no published SPF:

From: "Microsoft Corporation Inc"<[email protected]>
From: Microsoft Corporation <[email protected]>

Then again, on the basis of my small corpus the rule could be dropped entirely
as the spam samples I have would have scored highly even without it. But my
mail feed is very low volume and fairly heavily filtered at SMTP time. Grepping
quickly through the SMTP-time rejects I see plenty of envelope senders that are
clear Microsoft fakes, so I suspect that I'm only seeing a very small portion
of the spam that the rule was designed to hit.

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